cgrb-0706.qxd
11/12/01
12:15 PM
Page 64
LESSON
NAME _________________________________________________________ DATE ___________
7.6
Practice A
For use with pages 393 –399
Lesson 7.6
Match the key word with the descriptive phrase.
1. dilation
A. the ratio of CP′ to CP of a dilation
2. reduction
B. a dilation in which the image is larger than the original figure
3. enlargement
C. a dilation in which the image is smaller than the original figure
4. scale factor
D. a transformation with center C and scale factor k that maps each
point P to an image point P′ so that P′ lies on CP
&*( and
CP′ k CP
Tell whether the dilation is a reduction or an enlargement.
5.
P
P
6.
C
R
X
X
Y
C
P
7.
P
Y
C
R
Z
R
R
Z
Tell whether the dilation is a reduction or enlargement. Then find
its scale factor.
8.
R
9.
R
R
P
P
2
R
8
10.
C
P
5
P
3
S
S
C
8
P
C
R
6
R
P
Find the scale factor of the dilation.
11.
12.
C
P
P
13.
C
C
3
5
2
P
5
5
P 8
P
P
You are given a pattern PQRS for a kite. You want to make
a different kite P ′Q ′R ′S ′.
14. Tell whether the dilation is a reduction or an enlargement.
8
C
13 P
S
P
S
15. Find the scale factor of the dilation.
R
R
64
Geometry
Chapter 7 Resource Book
Copyright © McDougal Littell Inc.
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Answer Key
Practice A
1. D 2. C 3. B 4. A 5. enlargement
1
6. reduction 7. enlargement 8. reduction; 2
5
11
3
9. enlargement; 10. reduction; 11. 3
5
5
2
8
13
12. 13. 14. enlargement 15. 5
5
8