Lesson 7.2

Name
Class
Date
Practice
7-2
Form K
Similar Polygons
List the pairs of congruent angles and the extended proportion that relates the
corresponding sides for the similar polygons.
1. ABCD , WXYZ
2. nGHI , nKJL
W
G
L
A
Z
D
B
C
X
Y
H
u
lZ
/D > u
u
/C > lY
K
I
u
lL
/I > u
/B > lX
/A > /W
J
u
/G > lK
u u
u u
DA
CD
BC
AB
5
5
5
WX
XY
YZ
ZW
/H > lJ
IG
HI
u
u
5
JL
LK
u
u
GH
KJ 5
Determine whether the polygons are similar. If so, write a similarity statement
and give the scale factor. If not, explain.
3.
3
C
6
4
Q
D
8
6
T
3 E
F
CDEF M QRST; 3 i 4
4. Q
R
R
5.
10
O
3
U
no; corresponding sides not proportional
S
6.
D
8
I
B
6
4
V
S
12
R
S
M
L
4
8
8
4
T
88
49
12
N
8
6 43
9
H
C
49
4
J
kDBC M kJHI; 3 i 2
U 3 T
no; corresponding sides not proportional
Algebra The polygons are similar. Find the value of each variable.
7.
12
y
12
8.
6
15
a
b
4
x
18
9
9
7.2; 6
10
12
6; 8
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Name
7-2
Class
Date
Practice (continued)
Form K
Similar Polygons
9. You want to enlarge a 3 in-by-5 in. photo. The paper you will print on is
8.5 in.-by-14 in. What is the largest size the photo can be? 8.4 in.-by-14 in.
10. For art class, you need to make a scale drawing of the Parthenon using the
scale 1 in. = 5 ft. The Parthenon is 228 ft long. How long should you make the
building in your scale drawing? 45.6 in.
11. Ella is reading a map with a scale of 1 in. 5 20 mi. On the map, the distance
Ella must drive is 4.25 in. How many miles is this? 85 mi
Algebra Find the value of z. Give the scale factor of the polygons.
12. nJKL , nQRS 2; 1 i 3
Q
K
3
9
R
z4
J
z
L
S
13. The scale factor of ABCD to EFGH is 7 i 20. What is the scale factor of
EFGH to ABCD? 20 i 7
In the diagram below, kNOP M kWXY . Find each of the following.
14. the scale factor of nNOP to nWXY 2 i 5
15. m/X 58
W
N
16. m/Y 73
NP 2
17. WY 5
18. WX 15
49
12
6
58
O
4
P
Y
X
10
19. NP 4.8
20. A company makes rugs. Their smallest rug is a 2 ft-by-3 ft rectangle.
Their largest rug is a similar rectangle. If one side of their largest rug is 18 ft,
what are the possible dimensions of their largest rug? 18 ft-by-27 ft or 12 ft-by-18 ft
Prentice Hall Foundations Geometry вЂў Teaching Resources
Copyright В© by Pearson Education, Inc., or its affiliates. All Rights Reserved.
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