Author: Khan Academy via YouTube
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https://www.khanacademy.org/math/grade-7-math-tx/xa876d090ec748f45:volume-and-surface-area/xa876d090ec748f45:understand-volume-of-pyramids/v/volume-of-rectangular-pyramid-part-1-cube

Explore why the formula for the volume of rectangular pyramids has a 1/3 in it! We’ll start by investigating with a cube.

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