radius = diameter/2
Diameter = twice the radius = 2 x 18 = 36 inches.
V = 3.14 x 42 x 18 = 904.32
Francium has the largest atomic radius among all elements.
The radius is equal to half of the diameter. So the radius in this case would be 18/2 = 9 inches.
64 pi ie just over 201 sq cm