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Properties of Similar Polygons
Lesson #4
Pg. 131
Vocabulary
• Similar Polygons
– Polygons that have the same shape
• Scale Factor
– The ratio of the lengths of two corresponding
sides of two similar polygons
• Math Symbols
– Congruent
• 
– Similar
• ~
What you will learn…
– Similar Polygons
– Finding missing measures
– http://www.youtube.com/watch?v=9IUI3jtSEWU
Real World Link
– Are the prints in proportion?
Figure
Side Length (cm)
Angle Measure (cm)
DE
EF
FD
D
E
F
LJ
JK
KL
L
J
K
∆𝐸𝐹𝐷
∆𝐿𝐽𝐾
– Are the side lengths in proportion?
– What do you notice about the angles?
Similar Polygons
• If two polygons are similar, then…
– There corresponding angles are congruent
– The measures of their corresponding sides
are in proportion
Y
B
X
A
– Symbols
C
Z
ABC : XYZ
Examples
• Determine whether rectangle HJKL is
similar to rectangle MNPQ. Explain.
N
J
3
3
P
K
7 10
7
H
6
10
L
M
6
Q
Examples
• Quadrilateral WXYZ is similar to
quadrilateral ABCD
W
•
X
Describe the transformations. A
B
13
•
Find the missing measure.
D
24
m
12
10
C
Z
15
Y
Homework
HC: PG. 135-136 (1-11)
CC: PG. 135-136 (1-5, 7, 9-11)
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