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McGraw Hill Integrated II, 2012 View details

6. Surface Areas and Volumes of Spheres

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Exercise 15 Page 852

The surface area of a sphere is four times the product of π and the square of the radius.

127.8ft^2

Practice makes perfect

The surface area of a sphere is four times the product of π and the square of the radius. S=4π r^2We are told that the area of a circle is approximately 32 ft^2. Let's use the formula for the area A of a circle to find the radius r.

A=π r^2

Substitute

A= 32

32=π r^2

DivEqn

.LHS /π.=.RHS /π.

32/π=r^2

UseCalc

Use a calculator

10.18 ≈ r^2

SqrtEqn

sqrt(LHS)=sqrt(RHS)