It comes from Calculus. You are integrating a function which has some form of y²dy {dy is the height of a tiny horizontal slice, which is the shape of a square which is area y²}. The integral of y²dy is y³/3
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Because the volume of a pyramid is 1/3 times base area times height
Volume of a pyramid in cubic units = 1/3*base area*height
Volume = 1/3*base area*height
Volume of a pyramid = 1/3*base area *height
1/3 * B * h In this formula you find the area of the base, times it by the height, then divide that answer by 3. (also can be 1/3 * l * w * h - they are the same thing)