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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 26 Page 654

Let's recall the formula for finding a circumference.

8.4π m

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 4.2meters. By substituting 4.2 for r in the formula, we can calculate C.

C=2π r

r= 4.2

C=2π( 4.2)

CommutativePropMult

Commutative Property of Multiplication

C=2(4.2)π

Multiply

C=8.4π

The circumference of the circle is 8.4π m.

Subchapter links

Lesson Check p.654

Practice and Problem-Solving Exercises p.654-657

Standardized Test Prep p.657

Mixed Review p.657