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Private Library
Geometry 9-5 Congruence Transformations
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by Matthew Richardson
| 20 Questions
Note from the author:
A complete formative lesson with embedded slideshow, mini lecture screencasts, checks for understanding, practice items, mixed review, and reflection. I create these assignments to supplement each lesson of Pearson's Common Core Edition Algebra 1, Algebra 2, and Geometry courses. See also mathquest.net and twitter.com/mathquestEDU.
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1
10 pts
Solve It! Suppose that you want to create two identical wings for a model airplane. You draw one wing on a large sheet of tracing paper, fold it along the dashed line, and then tract the first wing. How do you know that the two wings are identical?
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2
10 pts
Problem 1 Got It?
A
B
C
D
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3
5 pts
Problem 2 Got It? Match congruent pairs of figures from the grid.
• JKHI
• MNQ
4
10 pts
Problem 2 Got It? What is a sequence of rigid motions that maps ABCD to JKHI? Write your response using either sentences or transformation notation.
5
10 pts
Problem 2 Got It? What is a sequence of rigid motions that maps MNQ to UVW? Write your response using either sentences or transformation notation.
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6
10 pts
Problem 3 Got It?
A
B
C
D
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7
30 pts
Problem 4 Got It? Complete a proof to verify the SSS postulate on the canvas.
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8
5 pts
Problem 5 Got It? Are the figures congruent?
Yes
No
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10
10 pts
A
B
C
D
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11
10 pts
A
B
C
D
12
10 pts
Reasoning: How can the definition of congruence in terms of rigid motions be more useful than a definition of congruence that relies on corresponding angles and sides?
13
10 pts
Reasoning: Is a composition of a rotation followed by a glide reflection a congruence transformation? Explain.
14
10 pts
Open-Ended: What is an example of a board game in which a piece is moved using a congruence transformation? Describe the congruence transformation in the context of the game.
15
10 pts
Review Lesson 9-4: A triangle has vertices A(3, 2), B(4, 1), and C(4, 3). Find the coordinates of the images of A, B, and C for a glide reflection with translation (x, y) → (x, y + 1) and reflection line x = 0.
• A'
• B'
• C'
16
10 pts
Review Lesson 5-6: The lengths of two sides of a triangle are given in the column on the right. Identify the range of possible lengths of the third side of each triangle.
• 16, 26
• 19.5, 20.5
• 9, 9
• 4.5, 8
17
10 pts
Review Lesson 7-2: Determine the scale drawing dimensions of the room using a scale of ¼ in. = 1 ft.

kitchen: 12 ft by 16 ft
4 ft by 5 ft 4 in.
3 ft by 4 ft
25 in. by 48 in.
3 in. by 4 in.
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18
10 pts
Vocabulary Review: ABC ≅ △DEF. Match the corresponding parts from each triangle.
• side DE
• ∠C
• ∠E
• side EF