V = 1/3 B * H where B is the area of the base and H is the height
to find the base , we find the area
B = s^2 where s is the side length
so
V = 1/3 s^2 *H
V = 1/3 * 11^2 * 12
V = 1/3 * 121 * 12
V = 484 cm^3
Choice B
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