the diameter of a tennis ball is 6.25 find the voule use 3.14
Are you sure? I've never seen a tennis ball that large.
The official diameter of a tennis ball is between 2.6 and 2.7 inches.
However:
Find the volume. V = 4/3 (pi) r^3
r = 0.5 * diameter = 0.5 * 6.25 = 3.125
r^3 = 30.5176
pi * r^3 = 3.14 * 30.5176 = 95.8253
V = 4/3 (95.8253) = 127.7671 cubic inches