Givens
Formula: V = 1/3 * pi * r^2 * h
pi = 3.14
r = d/2 = 12/2 = 6
h = 6
Substitute and Solve
V = 1/3 * 3.14 * 6^2 * 6
V = 226.2 m^3 Note: 10 digits of pi was used. Answer