Where r = radius, r = diameter/2, h = height.
Volume of a cylinder = πr²h
r = diameter/2 = 12 / 2 = 6 inches.
h = 10
V = πr²h
V = π * 3² * 6 = π*9*6 = 54π
Volume = 54π cubic inches
Assuming π ≈ 3.14159
V = 54π ≈ 54 * 3.14159 ≈ 169.64586
Volume V = 54π in³ or ≈ 169.65 in³
I hope this helped.