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McGraw Hill Integrated II, 2012 View details

6. Surface Areas and Volumes of Spheres

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Exercise 9 Page 852

Use the formula for the circumference of a circle to find its radius.

About 277.59 cubic inches

Practice makes perfect

A basketball used in professional games can be modeled by the following sphere.

Let r denote its radius. We know that the circumference of the ball is 29.5 inches. We are asked to find its surface area. First, let's find r using the formula for the circumference of a circle.

C=2π r

Substitute

C= 29.5

29.5=2π r

▼

Solve for r

RearrangeEqn

Rearrange equation

2π r=29.5

DivEqn

.LHS /2π.=.RHS /2π.

r=29.5/2π