Worksheet Instructions: Fill in the missing information. quadrilateral 12) 9.8 10.6 9.8 16 74 ° 106 ° 106 ° 74 ° isosceles trapezoid State all possible name for each figure. I start easy and work up to more challenging problems. Properties Of Quadrilaterals Worksheet : Quadrilateral Worksheet / It is a parallelogram with four congruent sides.. O is the centre of circle. Showing that the diagonals are congruent is a great way to show that a figure is a rectangle when you already know that the figure is a parallelogram. Prove that the diagonals of a rectangle are congruent. of O SSS CPCTC CPCTC Theorem 6-10 Reﬂ exive Prop. Examples: 1. — r 11/0 Find the value Of x and y that ensure each quadrilateral is a . View Lesson 16-2 Proving a Quadrilateral is a Rectangle HG Practice.pdf from MATH 3014 at Richardson H S. Lesson 16-2 Proving a Quadrilateral is a Rectangle … To prove whether a given quadrilateral is a parallelogram, there are five possible ways. Given the following quadrilateral is a maznþus, DB - -25 mZFCB = If a parallelogram is a rhombus, then each diagonal bisects a pair of opposite angles. If a parallelogram has one right angle it is a rectangle. This worksheet is all about proving quadrilaterals are parallelograms. Get Free Proving A Quadrilateral Is A Parallelogram Proving A Quadrilateral Is A Parallelogram Yeah, reviewing a ebook proving a quadrilateral is a parallelogram could go to your close friends listings. All the properties of a parallelogram apply by definition. 2. Parallelogram on the coordinate plane . Some of the worksheets displayed are polygons quadrilaterals … Proving a Quadrilateral Is a Rectangle Learning Targets:t t Develop criteria for showing that a quadrilateral is a rectangle. Note that the second and third methods require that you first show (or be given) that the quadrilateral in question is a parallelogram: If all angles in a quadrilateral are right angles, then it’s a rectangle (reverse of the rectangle definition). (Actually, you […] Criteria proving a quadrilateral is parallelogram. How to use worksheets for best effect: Give children worksheets appropriate for their level. About This Quiz & Worksheet. ���>*�uŜ�`Zf�t�╘��r���U��+�&J�)��Ă�:_�� �97�W0����h�V�Sl(�p��*����6��^&¥Zb�d�����D�7�=�УАr��[vm;z�sv�}�#��у�y�5�G������s㱛g�n��aއn�?{q�.|�Y�u��v_�m�O���^^��?�g�ֽ���?��?��~�[��K��o�����uo�����1}�����W��w�����_-���ӏ����_�_�?�߆��O����O]�������O����c���? A rectangle is a parallelogram with four right angles. to both of its consecutive '. Proving things about lines Pg 351 #12-16 Pg 353 #42-44 1/15 12/13 Proving Types of triangles/Trapezoid Worksheet HW tri/traps 1/16 14 Proving parallelograms Worksheet Prove JOHN is a parallelogram 1/17 15 QUIZ Proving Rectangles Worksheet Prove WARD is a rectangle 1/21 16 Proving Rhombus Worksheet Prove DROW is a rhombus h�(A,�,�[p��f� T��K�^X}���-E�LyKe_��� 2��kT�����Yr��p UNIT 5.5 Quadrilateral Proofs Date Page(s) Topic Homework 12/13 2 Prove a quadrilateral is a parallelogram Worksheet 12/14 3 Prove a quadrilateral is a rectangle or a rhombus Worksheet 12/17 4 Quiz Prove a quadrilateral is a square None 12/18 5 Proof with quadrilateral properties Worksheet 12/19 X Review all properties Ticket-In If a quadrilateral is a parallelogram, then its diagonals bisect each other. Note that the second and third methods require that you first show (or be given) that the quadrilateral in question is a parallelogram: If all angles in a quadrilateral are right angles, then it’s a rectangle (reverse of the rectangle definition). If a quadrilateral is a parallelogram, then its opposite sides are congruent. <> Showing top 8 worksheets in the category - Conditions For Rectangles Rhombuses And Squares. It is a 4 sided polygon with opposite sides parallel. Proving That a Quadrilateral is a Rectangle One can prove that a quadrilateral is a rectangle by first showing that it is a parallelogram and then using either of the following methods to complete the proof. How do you know? This is a worksheet to support students' learning of the different ways to prove that a quadrilateral is a parallelogram. 6 6 4 4 In Exercises 9–12, fi nd the values of x and y that make the quadrilateral a parallelogram. In this lesson, we defined a rhombus as a quadrilateral … If a parallelogram is a rectangle, then its diagonals are congruent. 2) If all opposite sides of the quadrilateral are congruent. Definitions: A quadrilateral is a Parallelogram IFF it has two sets of parallel sides. Conditions for Rectangles, Rhombuses, and Squares. �����a�ٝ�]! Lesson Summary. 12; 14 21.5; 39 7; 3 9; 18 kCDA Given Reﬂ exive Prop. Example 1 proves an additional way to show that a quadrilateral is a parallelogram. Showing top 8 worksheets in the category - Proving Quadrilaterals. This Proving Quadrilateral Properties Worksheet is suitable for 9th - 11th Grade. Worksheets > Math > Grade 6 > Geometry > Area of triangles & quadrilaterals. A square is a parallelogram with four congruent sides and four right angles. Lesson 6-3Proving That a Quadrilateral Is a Parallelogram321 Proving That a Quadrilateral Is a Parallelogram Theorems 6-5 and 6-6 are converses of Theorems 6-1 and 6-2, respectively, from the previous lesson.They provide two ways to conclude that a quadrilateral is a parallelogram. Solution: For part a, the opposite angles are equal, so by the Opposite Angles Theorem Converse, is a parallelogram. -Either start by proving that ASRP z- AQPR, and then showing both pairs of opposite sides congruent. Start studying Proving a Quadrilateral Is a Parallelogram. Explain why or why it does not work. Decimal place value worksheets. Quadrilateral Rectangle from Worksheets Naming Quadrilaterals , source: scribd.com. How do you know? �T��Y��\�x�T���Xn�l>ܗ�H�Ke��%r��R��r����T��-.�cWC�R�I"���a��n�UF~�h�r����N�)�`�M�᧧b�\�D𧻓ҊYsa����Њm���*E6O�K0K���>;�EK������5����Y� |�q��\��� 6��d�0��gĚ V��]���*���[%�%W�~����jѭ3X!#��1����#9Q�s�xK7E�˥����L�Jq����<3���yD03 ��K.̮(�>���v�>�fW� Complementary and supplementary word problems worksheet. Example 1 proves an additional way to show that a quadrilateral is a parallelogram. If a quadrilateral meets any of the 5 criteria below, then it must be a parallelogram. A rectangle is a parallelogram with four right angles. 12; 14 21.5; 39 7; 3 9; 18 kCDA Given Reﬂ exive Prop. 11. Worksheet will open in a new window. To get a rectangle or a parallelogram, just join the midpoints of the four sides in order. Proving That a Quadrilateral Is a Parallelogram One l must be suppl. 20 20 14 14 5. The worksheets should require a young child to consider merely a little. Dimensions of a rectangle from coordinates. They explore the characteristics of rectangles, rhombuses, and squares. Subjects: Algebra, Geometry. 3) … Jan 2010 4 0. A quadrilateral is a rectangle if and only if it has four right angles. Proving Quadrilaterals. ?x�)�8 We additionally provide variant types and in addition to type of the books to browse. • If one pair of opposite sides of a quadrilateral is BOTH congruent and parallel, of O kDAB SSS lD lC. The four vertices of a cyclic quadrilateral lie on the circumference of the circle. Thread starter GR9STUDENT; Start date Jan 10, 2010; Tags algebraically proving quadrilateral rectangle; Home. A quadrilateral is a Rhombus IFF it has four congruent sides. Then proving a right angle by stating that perpendicular lines have negative reciprocal slopes. As understood, deed does not recommend that you have astounding points. A quadrilateral is a Rectangle IFF it has four _____ _____. Properties of triangle worksheet. There are three ways to prove that a quadrilateral is a rectangle. Theorem 6-12 If one pair of opposite sides of a quadrilateral is both congruent and parallel, then the quadrilateral is a parallelogram. (See Example 2.) Or-Show how alternate interior angles give us 2 pairs of opposite sides parallel. A quadrilateral is a Rectangle IFF it has four _____ _____. If two parallel lines are cut by a transversal alternate interior angles are equal. 9 9 8. Integers and absolute value worksheets . N 0 EA Slnl I br 2iQgkhlt LsJ br Ee TsHenrpvde PdX.8 7 GMVaPdpet Fwli KtBh V nI 6n2fdian 8ift det KG5e CoPm VeHt5rYys. ���ڶO\]���3Ŝ&Ǒ�1F����;���1�a�ǃ���\h��6;7Ӕ�ʎ����(�VQ��`I=�{Wt�|���ٝR��f�$�J�]M=�#�F �=�\�vi>�jc��=uv7��e�{�zjؗ�K[��v9�m����ǥW�����[�jSe��a� l� 9G���'�� ~�:���� ���������`�>�ؽ���Zb��k��@�=���Vv��@�kG�ox���nq��ڗ��t3V� ,_fwh��w�9�[�N��� �P��?���[$ٌ+@��RYr繙!���L��>p��L��;��ŉb�Sa�f����f��}�M�B|NL+P؇����9�R2OP��k�������5|`�I�.�q*0S�}׀��F��������T��{���o:9� �b���4@W:~�E� >��XQOPPK9~�%|�I,L틮���UG��Q�yMP�r�ẪߠYX/p�. Example 2: Is quadrilateral a parallelogram? o��%��$����ȈjG�m���j"I�NTi�3*�$�>�Xt���}p� ��'�di5���b��3��� �,�p_�*��Y�Ŷ�ţb�ԁ�K&F|�LA$?�{R 6��ѻg��� (�:-� In order to prove that the diagonals of a rectangle are congruent, consider the rectangle shown below. A parallelogram, on the other hand, is a quadrilateral having two pairs of opposite parallel sides. If a quadrilateral is a rectangle, then it is a parallelogram. 1) :l:f both pairs of opposite sides are parallel, then the quadrilateral is a parallelogram, 2) If both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram. If a parallelogram has one right angle it is a rectangle. G. GR9STUDENT . This is just one of the solutions for you to be successful. Bisecting Diagonals If the diagonals of a quadrilateral bisect each other, then x�����U� �\˔�ǐ~#����~w+��VVH�Ҏ�� Proving trigonometric identities worksheet. Conditions For Rectangles Rhombuses And Squares - Displaying top 8 worksheets found for this concept.. Theorem 6-11 If the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram. Use the method indicated. Complete the following definition. Quadratic equations word problems worksheet. Geometry Worksheet Quadrilaterals Section: Name: Mr. Lin 6 38. (See Examples 1 and 3.) 1) If a quadrilateral has one pair of sides that are both parallel and congruent. Quadrilateral Definition. Algebra. Some of the worksheets displayed are Quadrilateral proofs packet 2, Geometry work quadrilaterals, Proofs of quadrilateral properties, Name geometry proving that a quadrilateral is a, Polygons quadrilaterals and special parallelograms, Proving a quadrilateral is a rhombus rectangle or a, Geometry honors … Grades: 8 th, 9 th, 10 th, 11 th, 12 th. Practice: Quadrilateral problems on the coordinate plane. Theorem A parallelogram is a rectangle if and only if its diagonals are congruent. Proving trigonometric identities worksheet Prove that if both pairs of opposite sides of a quadrilateral are equal, then the quadrilateral is a parallelogram. Square Corollary A quadrilateral is a square if and only if it is a rhombus and a rectangle. Prove that if a quadrilateral has diagonals that bisect each other, then it is a parallelogram. Proving that a Quadrilateral is a Square There are many ways to do this. Proving that a Quadrilateral is a Parallelogram Any of the methods may be used to prove that a quadrilateral is a parallelogram. Give the most specific name to the following figures. While the definition states “parallelogram”, it is sufficient to say: “A quadrilateral is a rectangle if and only if it has four right angles.”, since any quadrilateral with four right angles is a parallelogram. Quadrilateral 1: Plot and label each point. Sum of the angles in a triangle is 180 degree worksheet. 7. We can do this by showing that that the diagonals are congruent or by showing that one of the angles is a right angle. Remember, that a quadrilateral is any two-dimensional flat shape having four sides. Parallelogram on the coordinate plane. Showing top 8 worksheets in the category - Proving Quadrilaterals. The platform swings back and forth, higher and higher, until it goes over the top and 3. 3) Both pairs of opposite sides are parallel. Quadrilateral problems on the coordinate plane. Criteria proving a quadrilateral is parallelogram. Example 3. Types of angles worksheet. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Area and perimeter worksheets. 2 Table of Contents Day 1 : SWBAT: Prove Triangles Congruent using Parallelogram Properties Pages 3 - 8 HW: Pages 9 - 10 Day 2: SWBAT: Prove Quadrilaterals are Parallelograms Pages 11 - 15 HW: pages 16 - 17 Day 3: SWBAT: Prove Triangles Congruent using Special Parallelogram Properties Pages 18-23 HW: pages 24 - 25 Day 4: SWBAT: Prove Triangles Congruent using … Quadrilateral Proofs Worksheet With Answers. Solution: For part a, the opposite angles are equal, so by the Opposite Angles Theorem Converse, is a … If a quadrilateral meets any of the 5 criteria below, then it must be a parallelogram. �rB Prove that the points represent the vertices Of a parallelogram. It may be easier to show that one of the angles is a right angle because we have already computed all of the slopes. We can use the one of the following three ways to prove that quadrilateral is a rhombus. Prove that the quadrilateral with vertices A(0,0), B(4,3), C(7,-1) and D(3,-4) is a square. Other ways would include showing that the shape has 4 right angles. Some of the worksheets for this concept are Quadrilateral proofs packet 2, Geometry work quadrilaterals, Proofs of quadrilateral properties, Name geometry proving that a quadrilateral is a, Polygons quadrilaterals and special parallelograms, Proving a quadrilateral is a rhombus rectangle or a, Geometry honors coordinate geometry proofs, Geometry coordinate geometry … Up Next. Since the purpose is to prove a statement, you must show work. Some of the worksheets displayed are Packet conditions for rhombuses rectangles 1 and, Classwork, Properties of special parallelograms, Rhombuses rectangles and squares, X is abcd a square, Name geometry proving that a quadrilateral is a, Proving a quadrilateral is a rhombus rectangle … COROLLARIES For Your Notebook RHOMBUS C OROLLARY Displaying all worksheets related to - Proving Quadrilaterals. This is the converse of parallelogram theorem #4 from Example C. Draw a quadrilateral with diagonals that bisect each other and preview the proof. Proving That a Quadrilateral Is a Parallelogram One l must be suppl. You can use the corollaries below to prove that a quadrilateral is a rhombus, rectangle, or square, without first proving that the quadrilateral is a parallelogram. Section 7.3 Proving That a Quadrilateral Is a Parallelogram 381 7.3 Exercises In Exercises 3–8, state which theorem you can use to show that the quadrilateral is a parallelogram. 100° 100° 4. If a quadrilateral has 2 pairs of opposite sides ≅, then the quad. 388 previous quadrilateral parallelogram diagonal core vocabularycore vocabulary ccore ore cconceptoncept rhombuses rectangles and squares a rhombus is a parallelogram with four congruent sides. Show Step-by-step Explanations. Theorem 5-10: If a quadrilateral has one set of parallel lines that are also congruent, then it is a parallelogram. 1) If Parallelogram, then Opposite Angles Are Congruent. The same can be proved for the other set of angles. ... Great worksheet to have kids practice proving if a quadrilateral is a rectangle. rectangle 4) kite 5) quadrilateral 6) rhombus 7) 8 13.6 8 13.6 rectangle 8) 12.9 12.9 12.9 12.9 104 ° 76 ° 76 ° 104 ° rhombus-1-©n b2N0D1T2 y fK5uGtVaS USbo 1f1t Fwdalrte 8 sL vLdC3. This geometry video tutorial provides a basic introduction into proving kites using two column proofs. • Their significant properties are proven, mostly using congruence. Geometry worksheets: Area of triangles & quadrilaterals. Thus, it is proved that the diagonals bisect the vertex angles. I can plot it on a graph, but I can't figure out how to prove … stream Proving quadrilateral is a rectangle algebraically. 1) If a quadrilateral has one pair of sides that are both parallel and congruent. Some of the worksheets displayed are Quadrilateral proofs packet 2, Geometry work quadrilaterals, Proofs of quadrilateral properties, Name geometry proving that a quadrilateral is a, Polygons quadrilaterals and special parallelograms, Proving a quadrilateral is a rhombus rectangle or a, Geometry honors coordinate … Properties of parallelograms worksheet. is a . 1) If both pairs of opposite sides of a quadrilateral are _____, then the quadrilateral is a parallelogram. Properties of triangles and quadrilaterals. Example 2: Is quadrilateral a parallelogram? - No - eau 5) 1150 650 6) 650 1150 go. • Tests for them are established that can be used to check that a given quadrilateral is a parallelogram or rectangle – again, congruence is mostly required. Some of the worksheets for this concept are Quadrilateral proofs packet 2, Geometry work quadrilaterals, Proofs of quadrilateral properties, Name geometry proving that a quadrilateral is a, Polygons quadrilaterals and special parallelograms, Proving a quadrilateral is a rhombus rectangle or a, Geometry honors coordinate geometry proofs, Geometry coordinate geometry proofs. A rectangle is a parallelogram with four right angles. Rectangle Theorem #2: A rectangle has congruent diagonals. Properties of parallelogram worksheet. A rectangle is a parallelogram with four right angles. Geometry Worksheet Quadrilaterals Section: Name: Mr. Lin 6 38. Quadrilateral problems on the coordinate plane. The part of a ruler shown is a rectangle Proving triangle congruence worksheet. Bisecting Diagonals If the diagonals of a quadrilateral bisect each other, then Some of the worksheets for this concept are Packet conditions for rhombuses rectangles 1 and, Classwork, Properties of special parallelograms, Rhombuses rectangles and squares, X is abcd a square, Name geometry proving that a quadrilateral is a, Proving a quadrilateral is a rhombus rectangle … A quadrilateral is a plane figure that has four sides or edges, and also have four corners or vertices. 1. 112° 112° 68° 68° 7. Section 7.3 Proving That a Quadrilateral Is a Parallelogram 377 Identifying a Parallelogram An amusement park ride has a moving platform attached to four swinging arms. In this quadrilateral properties worksheet, students use the properties of parallelograms to complete given statements. Step 3: Next, prove that the parallelogram is a rectangle. Below are six versions of our grade 6 math worksheet providing practice on determining the area of triangles & quadrilaterals. A(-5, 6), B(3, 7), C(4, -1), and D(-4, -2). 7 0 obj to both of its consecutive '. 6. %�쏢 While the definition states “parallelogram”, it is sufficient to say: “A quadrilateral is a rectangle if and only if it has four right angles.”, since any quadrilateral with four right angles is a parallelogram. If a parallelogram contains at least one right angle, then it is a rectangle … 10.3 Proving a Quadrilateral is a Parallelogram Theorems: • If both pairs of opposite sides of a quadrilateral are congruent, then the quadrilateral is a parallelogram. Different Ways of Proving. 6. Two Column Proof With Answers Key. X��dJ���R�`�\9 \�].�,� %PDF-1.4 Theorem 5-10: If a quadrilateral has one set of parallel lines that are also congruent, then it is a parallelogram. There are three ways to prove that a quadrilateral is a rectangle. 2) If all opposite sides of the quadrilateral are congruent. In this lesson, we will show you two different ways you can do the same proof using the same rectangle. Displaying top 8 worksheets found for - Proving Quadrilaterals. A square is a parallelogram with four congruent sides and four right angles. Accelerated Geometry/ Algebra 2 U2 Worksheet F- Proving Quadrilaterals Day 2 The goal of this assignment is to use the midpoint, distance and slope formulas to prove statements about geometric figures on the coordinate plane. The area of a cyclic quadrilateral is \(Area=\sqrt{(s-a)(s-b)(s-c)(s-d)}\) where a, b, c, and d are the four sides of the quadrilateral. 8.3 Worksheet Proving Parallelograms Determine if each quadrilateral is a parallelogram. Worksheet — Properties Of Quadrilaterals Name 1. of O SSS CPCTC CPCTC Theorem 6-10 Reﬂ exive Prop. Give a simple worksheet for a concept immediately after you teach that concept. If a quadrilateral is a parallelogram, then its opposite angles are congruent. Some problems give students the graph, some give the coordinates. Complete the following theorems which provide four more ways. When you are trying to prove a quadrilateral is a rectangle which method should you use: 1) Prove the shape is a parallelogram by doing slope 4 times by stating that parallel lines have equal slopes. Proving a quadrilateral is a parallelogram. This is a task on the concept of Proving a Quadrilateral is a Parallelogram. The rectangle is a plane shape with four sides. This is the currently selected item. Choose from the following: Quadrilateral, Parallelogram, Rhombus, Rectangle, Square Square Rectangle Parallelogram Quadrilateral _ 9, CD = Rhombus 25, & ,nZDCB 21.10. Find: 2. 5. �8���ˆ&؆��T�C�cWpλO����H+��T��9�8}���ӧO?���!�6�������4vO�=z�la�c�Jָ���QLiMS��'��u��.���\X1B2�����TA�v��}�F����.�Z�JK٩���)��'�M�-WH��j�|�* 14. The classmate is describing a rectangle, which is one type of parallelogram. Prove that if the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram. COROLLARIES For Your Notebook RHOMBUS C OROLLARY I recommend proving the diagonals bisect each other (parallelogram), are equal (rectangle) and perpendicular (rhombus). ~ 4 ~ Lesson 7: Proving Special Quadrilaterals Standard: G.GPE.4: Use coordinates to prove simple geometric theorems algebraically.Standard: G.GPE.5: Prove the slope criteria for parallel and perpendicular lines; use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point). Free Geometry Worksheet Proving that a Quadrilateral is a Parallelogram. A rhombus is a quadrilateral which means it has four sides. Quadrilaterals will typically be of standard shapes with four sides like rectangle, square, trapezoid, and kite or irregular and uncharacterized as shown below: Types of Quadrilaterals. of O … If a quadrilateral is a rhombus, then it is a parallelogram. }��w��~��~�[���~��=�|���3��w|~�}�7]�u�|���>�u�/��W��O����}���G��'�o�m?�G�������c���?����O��o��W��=��O����;?���G���|����������}j����{?���O��O������g��w��'_�I��G�5����_�����������O�W���y�_���G���������y������}ç�����?��O|O�������~�_��q�����?��|�w~�/����G'������������_���{��?��_����g��{���^r���W�'?�����/���������|�ѫ@��s��:��X��js} 7�lM#gdc���]W�U8�9���;�A�A�@���(�ހ���C��z��σ�M��A�>��P[�UQ1�G��\��l�LE�%K���d�GK�Q�.� |�m��䚤�%W yY��j�0K��2@���l���8�)�j֩(��6`h�����%�%�(q_��%�:��L�X��]2 f�#���s fɕ@~��\�Yr��%�\�Yr!�5��k���v�,��[Z���,�ғc�b�)�]�>1KQ,-�g�!�L!d���0��� Similar: Area of right triangles Area of triangles, parallelograms, trapezoids Prove that a quadrilateral is a rectangle. Jan 10, 2010 #1 How do you prove algebraically, that the following vertices are a rectangle. 8. Pre-University Math Help. The definition of a parallelogram gives one way to prove that a quadrilateral is a parallelogram (show both pair of opposite sides are parallel). • The parallelogram and rectangle are carefully defined. SUGGESTED LEARNING STRATEGIES: Think-Pair-Share, Create Representations, Group Presentation, Discussion Groups 1. Coordinates of rectangle example. Use the diagram at the right and Theorems 6-8 through 6–12 for Exercises 11–16. Special line segments in triangles worksheet. A parallelogram is a slanted rectangle with the length of the opposite sides being equal just like a rectangle. If a quadrilateral is a parallelogram, then its consecutive angles are supplementary. Read Free Proving A Quadrilateral Is A Parallelogram Proving A Quadrilateral Is A Parallelogram Right here, we have countless books proving a quadrilateral is a parallelogram and collections to check out. Displaying all worksheets related to - Two Column Proof With Answers Key. To download/print, click on pop-out icon or print icon to worksheet to print or download. You can & download or print using the browser document reader options. The classmate is describing a rectangle, which is one type of parallelogram. Assess your knowledge of using slope to prove and disprove a quadrilateral by using the quiz and worksheet. Forums. ... Special line segments in triangles worksheet. These worksheets are pdf files.. Because of the parallel lines, opposite sides are equal and parallel. To use worksheets for best effect: give children worksheets appropriate for Their level appropriate for proving a quadrilateral is a rectangle worksheet level:... 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