Download Day 2 Notes 7-2 Similar Polygons

Day 2 Notes 7­2 Similar Polygons
Pre­AP Geometry
Notes 7­2
Similar Polygons
Name___________________
Date______________Per___
Two polygons are similar if and only if their corresponding angles are ______________ and their corresponding sides are ______________.
In the diagram. WXYZ is similar to PQRS.
Similarity Statement
Congruent angles
Corresponding sides
Example 1: If list all pairs of congruent angles and write a proportion that relates the corresponding sides. Determine whether each pair of figures is similar. If so write the similarity statement and give the ratio of corresponding sides. If not, explain your reasoning.
2.
1.
3.
4.
Each pair of polygon is similar. Find x and y.
5.
6.
V
A
C
F
D
Z
W
Y
1
Day 2 Notes 7­2 Similar Polygons
When two polygons are similar, the size of the enlargement or reduction is called the _________________ .
For scale factor, think
new
old
or
old(scale factor) =
*
Caution:
new Your textbook
defines scale factor
differently. Your
answers will be the
reciprocal of the
books answers.
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The scale factor of The scale factor of 1. MP
2. VU
3.
2