Answer: Choice A) 384 cubic cm
The bottom face is a square with area 12*12 = 144 square cm
Multiply this base area by the height of the pyramid (8 cm) and we end up with 144*8 = 1152
The last thing to do is to divide this by 3 to get the final answer: 1152/3 = 384
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The segments FG = 6 and AG = 10 aren't used at all, though if you wanted the surface area, then you would use AG = 10.
The formula for the volume of a pyramid is
V = (1/3)*B*h
which is equivalent to
V = (B*h)/3
where,
V = volume, B = area of base, h = height of pyramid
