Question

A rectangular pyramid measures three feet by four feet at the base, and has a height of seven feet. Find its volume. A. 21 ft3 B. 42 ft3 C. 28 ft3 D. 84 ft3

Answer 1

C. 28 ft³

Explanation:

The general formula for the volume of a pyramid:

V =
`(1)/(3)Bh`, where B = the area of the base and h = height of the pyramid

Since the base is a rectangle, we can find area using the formula:

A = l x w or A = 3 x 4 = 12 ft²

Using B = 12 and h = 7:

V =
`((12)(7))/(3)`

V = 28 ft³