How do you find the volume of a frustum?

If it is the frustum of a pyramid: The volume of a pyramid (with a square base) is: Length_of_base * Width_of_base * Height * 1/3 To get the volume of the frustum, subtract the volume of the top part (also a pyramid) from the full volume.

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frustum of a cone

the formula is

(h*pi)/3*(r1^2+r2^2+r1*r2)

this is where h = height r1= top radius r2=bottom radius