What is formula for the volume of a regular triangle pyramid?

Answer 1

The volume of a pyramid with is

V = 1/3 (A*h) where A is the area of the base and h is the height of a side

For a rectangular base of length a and width b, the formula becomes [1/3 abh]

For a triangular base, the area is half of the rectangular area, so the formula is

V = 1/3 (1/2 a*b)(h) where a is the width of the triangle and b the height, or

V = (1/6)abh