This document contains notes from a math class on similar areas and polygons. It discusses that if two polygons are similar, the ratio of their areas is equal to the ratio of the squares of their corresponding side lengths. The notes also include worked problems from a homework assignment involving finding the areas of similar polygons and trapezoids.

1. 11.3 Similar Areas
HW pg. 740 #6­16 evens 1
March 26, 2014
BellworkFind the area.
3. The height of a trapezoid is 8 feet. One base is
twice as long as the other, and the area is 72
square feet. How long is each base?
6 ft; 12 ft
1072 ft2
144 cm2

2. 11.3 Similar Areas
HW pg. 740 #6­16 evens 2
March 26, 2014
11.3 Perimeter & Area of Similar Figures
Area of Similar Polygons: If 2 polygons are ~, then
the ratio of areas is a2:b2.
1 2
b
A
Polygon 1 ~ Polygon 2
Side length: a/b Area: a2/b2

3. 11.3 Similar Areas
HW pg. 740 #6­16 evens 3
March 26, 2014

4. 11.3 Similar Areas
HW pg. 740 #6­16 evens 4
March 26, 2014

5. 11.3 Similar Areas
HW pg. 740 #6­16 evens 5
March 26, 2014

6. 11.3 Similar Areas
HW pg. 740 #6­16 evens 6
March 26, 2014
11.3 HW pg. 740 #6-16 evens