Respuesta :

A. need the circumference formula which is C=2pir
30= 2(3.14)(r)
30=6.28r
4.77=r
4.8=r
4.8 + 4.8 = 9.6
9.6 is the diameter
B. diameter of hoop - diameter of bball
18 - 9.6 = 8.4
so bball diameter is about 8.4 less than the hoop's diameter