Answer:
V = 324 cm³
Explanation:
the volume (V) of the pyramid is calculated as
V = Ah ( A is the area of the base and h the height )
here A = 9² = 81 cm² and h = 12 , then
V = × 81 × 12 = 27 × 12 = 324 cm³
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Ah ( A is the area of the base and h the height ) × 81 × 12 = 27 × 12 = 324 cm³