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Pearson Geometry Common Core, 2011

PG

Pearson Geometry Common Core, 2011 View details

6. Circles and Arcs

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Exercise 24 Page 654

Recall the formula for finding a circumference.

20π cm

Practice makes perfect

We are given the following diagram and we want to find its circumference.

The circumference C of a circle with diameter d is calculated using the formula below. C=π d From the diagram, we know that the diameter of the circle is 20centimeters. By substituting 20 for d in the formula, we can calculate C.

C=π d

d= 20

C=π( 20)

CommutativePropMult

Commutative Property of Multiplication

C=20π

The circumference of the circle is 20π cm.

Subchapter links

Lesson Check p.654

Practice and Problem-Solving Exercises p.654-657

Standardized Test Prep p.657

Mixed Review p.657