Formula for volume of frustum of pyramid
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the formula for the volume can be expressed as a product of this proportionality α/3 and a difference of cubes of heights h1 and h2 only. By factoring the difference of two cubes, a3 − b3 = (a − b)(a2 + ab + b2), one gets h1 − h2 = h, the height of the frustum, and αh12 + h1h2 + h223.
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