Volume of rectangular pyramids using rectangular prisms | Grade 7 (TX TEKS) | Khan Academy
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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-2-rectangular-prism
Explore why the formula for the volume of a rectangular pyramid has a 1/3 in it! We'll investigate a general rectangular prism. 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-2-rectangular-prism
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