Geometry 9-6 Dilations

by Matthew Richardson

| 20 QuestionsNote 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.

1

2

1

10 pts

Solve It! The pupil is the opening in the iris that lets light into the eye. Depending on the amount of light available, the size of the pupil changes. Observe the size and shape of the iris in normal light and in dim light. What charcteristics stay the same and what charcteristics change?

- Iris diameter
- Pupil diameter

- Remain the same
- Change

2

10 pts

Solve It! How do these observations compare to transformation of figures you learned about earlier in the chapter?

3

3

10 pts

Problem 1 Got It?

A

B

C

D

4

4

10 pts

Problem 2 Got It? Match the corrdinates of the vertices after the following transformation.

- (-1, 0.5)
- (0, -1)
- (1, -0.5)

- P'
- Z'
- G'

5

10 pts

Problem 2 Got It? Reasoning: How are the pairs of segments from the item above related?

7

7

10 pts

Problem 3 Got It?

A

B

C

D

8

8

10 pts

A

B

C

D

9

9

10 pts

A

B

C

D

10

10

10 pts

A

B

C

D

11

11

10 pts

A

B

C

D

12

13

12

10 pts

Explain and correct the error(s).

13

10 pts

Explain and correct the error(s).

14

10 pts

Review Lesson 9-5: △JKL has vertices J(23,2), K(4, 1), and L(1, 23). What are the coordinates of J', K', and L' after the translation?

Not all ordered pairs will be used.

- (25, 1)
- (-1, 3)
- (3, -20)
- (-25, 1)
- (6, 2)

- J'
- K'
- L'

15

16

17

15

10 pts

Review Lesson 7-2: TRSU ~ NMYZ. Find the value of a. Enter only a number.

16

10 pts

Review Lesson 7-2: TRSU ~ NMYZ. Find the value of b. Enter only a number.

17

10 pts

Review Lesson 7-2: TRSU ~ NMYZ. Find the value of c. Enter only a number.

18

10 pts

Vocabulary Review: Write the word isometry, congruence, or transformation to complete the sentence.

A mapping that results in a change in the position, size, or shape of a geometric figure is called a/an __?__.

19

10 pts

Use Your Vocabulary: Which of the pairs of items above shows a dilation?

The skateboards

The rings

The roller skates

20

10 pts

Reflection: Math Success

Add to my formatives list