Volume of pyramid and prism
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Book XII, Proposition 7, Euclid's Elements - David Joyce http://aleph0.clarku.edu/~djoyce/java/elements/bookXII/propXII7.html This shows a way to divide a triangular prism into three pyramids of equal volume; a little more work is needed to complete the proof for all pyramids and for cones, which Euclid does next.
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