How do you find the volume of a trapezoid

To compute the volume of a symmetric trapezoidal prism, you need to know four measurements: the length of the prism L, the height of the trapezoidal cross-section H, the base width of the trapezoid B, and the top width of the trapezoid A.

Alternatively, if you know the trapezoid's slant side lengths S, you can compute the volume with L, S, B, and A.

If the prism length is L, trapezoid base width B, trapezoid top width A, and trapezoid height H, then the volume of the prism is given by the four-variable formula: V (L, B, A, H) = LH (A + B) / 2.

" In other words, multiply together the length, height, and average of A and B."