Solving Quadratic Equations With Square Roots

Question

Find the radius of a globe with a surface area of 804 square inches. Round your answer to the nearest inch.

I have to use the equation S=4πr². How would I complete this problem?

Answer 1

The area of a sphere is given by the equation:

S = 4·π·r²

where:

1. S = the· surface area = 804 sq. in.
2. r = the radius

S = 4·π·r²

804 = 4·π·r²

Solve for r. The units are inches.