V= (Area of base)(height) divide the whole thing by 3
Both of these formulas work: V=1/3A*H or V=1/2L*H♥
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To find the perpendicular height of a square pyramid, first compute for the volume of the pyramid. Then divide the volume by the area of the base to find pyramid's height.
Volume of this pyramid is (area of base) x (height) / 3. The area of the base (square) is (edge)2 So (21 ft)2 * (18 ft)/3 = 26586 cubic feet
Volume=the area of the base times height divided by 3, so 289x19/3 which equals 1830 and one third.
Basically, the same as the volume of any other pyramid: the volume is (1/3) x base x height. The "base" refers to the area of the base; for instance, if the base is a regular pentagon, use the formula for a regular pentagon.
use the formula: Volume=1/3 x(times) the area of the base x(times) height (V=1/3Bh) plug in the numbers