 Solve the following proportions. a = 9 b = 7 c = 6 d = 6.

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Solve the following proportions

a = 9 b = 7 c = 6 d = 6

Using Proportions to Solve Geometry Problems Sections 6.1-6.3

Ratios & Proportions A ratio is a comparison of two values, usually showed as a fraction. A proportion is an equation in which two proportions are set equal to each other.

Properties of Proportions

Scale Factor Two polygons are similar polygons if corresponding angles are congruent and corresponding side lengths are proportional. The scale or scale factor is the ratio that describes how the dimensions of the two figures are related.

List all pairs of congruent angles. Check that the ratios of corresponding side lengths are equal. What is the scale factor?

Perimeters of Similar Polygons If two polygons are similar, then the ratio of their perimeters is equal to the ratio of their corresponding side lengths.

Perimeters of Similar Figures

Assignment pg. 367 #3-17 odds pg. 376 #6-17 all

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