Question

Five spheres are being painted for a display at a store . If the diameter of each sphere is 7 centimeters, which value is closest to the total surface area that will be painted?

Answer 1

2r pi = 7, r = 7/2pi
Volume = 4/3 pi r^3 = 4/3 pi 343/8pi^3 = 343/6pi^2
there are 5 spheres so total is 5*343/6pi^2 which is approximately
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