(Base x height) / 3. This works for cones as well.
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first you find the area of the base and then you find the area one side of the pyramid an you time it with 3 if it is a triangular pyramid or 4 if it is a square pyramid
1/3 base x height
Formula for volume of pyramid is 1/3*base area*height Formula for area of rectangle (in this case the base) is length*breadth So, the volume of the pyramid is 1/3*12*5*9=180m3
The formula to find the volume of a triangular pyramid is: 1/3 (1/2 B H ) H
The formula for a triangle-base pyramid (a form of tetrahedron) isV = 1/3 Bh where B is the area of the triangular baseFind the area of the base by the formula B = 1/2 bh (height of that triangle), then multiply by 1/3 of the pyramid'sheight.