Question 414190

As the surface area varies directly with the square of its radius....

12^2 =144,   3^2 = 9

if square of radius = 144 then area = 576π

it means, if square of radius = 1 then area = 576π/144 


now, we have to find the area if square of radius is 9 


( 576π/144)* 9 = 36π