r = 4 d = 6 A = 36π C = 18π

fill in the box with the appropriate measure
A=9TT r=9 c=12TT A=81TT a=16TT
c=6TT d=8 r=3 d=12 c=8TT d=18 r=6

A=36π r=4 c=8π A=16π c=6π d=8 r=2