SOLUTION: What is the radius of a tennis ball with a surface area of 28 in.�? A. 1.5 in. B. 1.8 in. C. 2.1 in. D. 2.4 in.

Question 261344: What is the radius of a tennis ball with a surface area of 28 in.�?
A. 1.5 in.
B. 1.8 in.
C. 2.1 in.
D. 2.4 in.
Found 2 solutions by Edwin McCravy, nerdybill:
Answer by Edwin McCravy(20055) (Show Source): You can put this solution on YOUR website!
What is the radius of a tennis ball with a surface area of 28 in.�?

A tennis ball is a sphere. The formula for the surface area of a sphere is We substitute 28 for A and solve for r Divide both sides by Take the square root of both sides: Punch that out on a calculator and you get 1.49270533 inches, which rounds to 1.5 inches, choice A. Edwin

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
surface area of any sphere is 4(pi)r^2
.
4(pi)r^2 = 28
(pi)r^2 = 7
r^2 = 7/(pi)
r = sqrt(7/(pi))
r = 1.5 inches

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