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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 5 Page 654

Recall the formula for finding a circumference.

18π cm

Practice makes perfect

In the given diagram, we want to find the circumference of ⊙ P.

The circumference C of a circle with radius r is calculated using the formula below. C=2π r From the diagram, we know that the radius of the circle is 9centimeters. By substituting 9 for r in the formula, we can calculate C.

C=2π r

r= 9

C=2π( 9)

CommutativePropMult

Commutative Property of Multiplication

C=2(9)π

Multiply

C=18π

The circumference of ⊙ P is 18π cm.

Subchapter links

Lesson Check p.654

Practice and Problem-Solving Exercises p.654-657

Standardized Test Prep p.657

Mixed Review p.657