Answer :
(See attached graphic)
13^3 = 12^2 + radius^2
radius^2 = 13^2 - 12^2
radius^2 = 169 -144
radius^2 = 25
radius = 5
13^3 = 12^2 + radius^2
radius^2 = 13^2 - 12^2
radius^2 = 169 -144
radius^2 = 25
radius = 5
