Question 1187680
The surface area of a sphere varies directly as the square of the radius. If the surface 
area is 36𝜋 𝑖𝑛
2 when the radius is 3 inches, what is the surface area of the sphere with 
a radius of 5 inches?
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{{{SA = 4pi*r^2 = 4pi*5^2 = 100pi}}}
The area at 3 inches is not relevant.
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 Using the area at r = 3 without using the formula, {{{36pi*(5/3)^2 = 100pi}}}