1. 6.3 Similar Figures November 16, 2012
Bellwork
Nov 29­8:47 AM
HW pg. 376 #4­12 evens, 20­28 evens 1

2. 6.3 Similar Figures November 16, 2012
6.3 Similar Polygons
Similar polygons: corresponding angles are congruent and
B C
corresponding lengths are proportional
F G
<A ≅ <E ...
A D E H
AB BC
-- = --
∴ ABCD ~ EFGH EF FG ...
Nov 29­8:57 AM
HW pg. 376 #4­12 evens, 20­28 evens 2

3. 6.3 Similar Figures November 16, 2012
Scale Factor: ratio of lengths of corr. sides in similar polygons
Nov 29­9:37 AM
HW pg. 376 #4­12 evens, 20­28 evens 3

4. 6.3 Similar Figures November 16, 2012
Nov 29­9:41 AM
HW pg. 376 #4­12 evens, 20­28 evens 4

5. 6.3 Similar Figures November 16, 2012
Perimeters of Similar Polygons Theorem: If 2 polys are ~,
then the ratio of perimeters = the ratios of corr. side lengths
If KLMN ~ PQRS, then KL+LM+MN+NK = KL = LM = MN= NK
K L
PQ+QR+RS+SP PQ QR RS SP
P Q
N M S R
Nov 29­9:45 AM
HW pg. 376 #4­12 evens, 20­28 evens 5

6. 6.3 Similar Figures November 16, 2012
Similarity & Congruence: If 2 figures are ≅, then they are ~.
If 2 figures are ~, then the ratio of corr. sides = scale factor
Nov 29­10:26 AM
HW pg. 376 #4­12 evens, 20­28 evens 6

7. 6.3 Similar Figures November 16, 2012
HW pg. 376
#4-12 evens,
20-28 evens
Nov 29­10:25 AM
HW pg. 376 #4­12 evens, 20­28 evens 7