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Graded Assignment
MTH203A: Geometry | Unit 4 | Lesson 18: Congruent Polygons and Special Quadrilaterals Unit Test
Name:
Date:
Graded Assignment
Unit Test, Part 2
Answer the questions below. When you are finished, submit this test to your teacher by the due date for full credit.
(15 points. 3 points for each correct answer.)
1.
Use this list to help you fill
in the blanks below:
*CPCTC
*Linear Pair Postulate
*Definition of a Square
*Diagonals bisect each other
(property of parallelograms)
*SSS Congruence Postulate
Provide the reasons for the proof.
Given: Square ABCD, Diagonals AC and BD
Prove: DEC and BEC are right angles.
Answer:
Statements
a. Square ABCD
Reasons
a. Given
b.
DC  BC
b.
c.
DE  BE
c.
d.
EC  EC
d. Reflexive Property of Congruence
e. DEC  BEC
f.
DEC  BEC
Definition of a square
Diagonals bisect each other
e.
SSS Congruence postulate
f.
Linear pair postulate
g. mDEC = mBEC
g. Definition of congruence
h. DEC supp BEC
h.
i.
mDEC + mBEC = 180
i.
Definition of supplementary angles
j.
mDEC = mBEC = 90
j.
Substitution and Division Property of Equality
k. DEC and BEC are right angles.
© 2006 K12 Inc. All rights reserved.
Copying or distributing without K12’s written consent is prohibited.
CPCTC
k. Definition of a right angle
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Graded Assignment
MTH203A: Geometry | Unit 4 | Lesson 18: Congruent Polygons and Special Quadrilaterals Unit Test
(5 points)
2. Read the flow chart proof below and determine the appropriate justification for the
question mark in the proof below. Note: look for the red circle to see the question mark.
Score
Answer:
© 2006 K12 Inc. All rights reserved.
Copying or distributing without K12’s written consent is prohibited.
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