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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 25 Page 654

Let's recall the formula for finding a circumference.

6π ft

Practice makes perfect

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

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 3feet. By substituting 3 for r in the formula, we can calculate C.

C=2π r

r= 3

C=2π( 3)

CommutativePropMult

Commutative Property of Multiplication

C=2(3)π

Multiply

C=6π

The circumference of the circle is 6π ft.

Subchapter links

Lesson Check p.654

Practice and Problem-Solving Exercises p.654-657

Standardized Test Prep p.657

Mixed Review p.657