Answer to Question #241403 in Civil and Environmental Engineering for Mr. Lee

Question

The volume of a frustum of a rectangular pyramid is 79.17 m3 with an altitude of 5 m. If the upper base has dimensions of 2.50 m x 4.0 m, find the area of the lower base.

Answer 1

For the area of the lower base.

we have altitude of $5m$

dimensions

let’s say

lenghth = $2.50m$

width=$4.0m$

so, as its rectangular pyramid for the lower base

$=2.50\times4\times5$

$=50m^3$