Asked by eric

if the diameter of a spherical ball is doubled,by what factor does its surface area increase?
Answered by bobpursley
Isn't surface area proportional to the square of diameter?
Answered by eric
yes but don't know wat surface area it increases
Answered by Reiny
SA of sphere is 2pi(r)^2

so if you change the radius from r to 2r (or d to 2d)
then the SA is 2pi(2r)^2 = 8pir^2

so by what factor did it increase ?
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