The answer is C. 256π in3
The volume of the cone (V) is:
V = 1/3·π·r²·h (r - radius, h - height)
We know:
r = 8 in
h = 12 in
V = ?
______
Just substitute all of these in the formula for the volume of the cone:
V = 1/3·π·r²·h = 1/3 ·π · 8² · 12 = 256π in³