Which expression shows how to determine the minimum amount of cement used to make each of the pyramids?

To find the amount of cement needed, calculate the pyramid’s volume: one third of the base area times its perpendicular height. The base area is 10 × 10 and the height is 12, so the expression is ⅓ × 10 × 10 × 12. Choice B shows this calculation; expressions involving the slant height or surface area do not give the volume.

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