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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

7. Perimeters and Areas of Similar Figures

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Exercise 4 Page 85

The ratio of the perimeters is the same as the ratio between corresponding side lengths.

4/5

Practice makes perfect

Let's start by considering the given similar figures.

similar figures

In the given similar figures, the lengths of two corresponding sides are 8 and 10. Therefore, we can say that the ratio between the corresponding side lengths is 8 10. Let's simplify this ratio.

8/10

a/b=.a /2./.b /2.

4/5

The simplified ratio between the corresponding side lengths is 45. In similar figures, the ratio of the perimeters is the same as the ratio between the corresponding side lengths.

Ratio of Corresponding Side Lengths	4/5
Ratio of Perimeters	4/5

Subchapter links

Try It p.84-85

Self-Assessment for Concepts & Skills p.85

Self-Assessment for Problem Solving p.86

Review & Refresh p.87

Concepts, Skills, & Problem Solving p.87-88