Download - Properties of Similar Polygons
Properties of Similar Polygons
Lesson #4Pg. 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?
– Are the side lengths in proportion?
– What do you notice about the angles?
Figure Side Length (cm) Angle Measure (cm)
DE EF FD
LJ JK KL
D E F
L J K
Similar Polygons
• If two polygons are similar, then…– There corresponding angles are congruent– The measures of their corresponding sides are in
proportion
– SymbolsA
B
C
X
Y
Z
ABC XYZ :
Examples
• Determine whether rectangle HJKL is similar to rectangle MNPQ. Explain.
7 7
3
3
10 10
6
6
H
J K
L
N P
M Q
Examples
• Quadrilateral WXYZ is similar to quadrilateral ABCD
• Describe the transformations.
• Find the missing measure.
X
1312
10
24
m
15
A
D
W
B
YC Z
