Proposition·Untested·2605.00009

Proposition XI.39

If there be two prisms of equal height, and one have a parallelogram as base and the other a triangle, and if the parallelogram be double of the triangle, the prisms will be equal.

Proof

A triangular prism is half a parallelogram prism on the same height (by I.34 applied to the cross-sections); the area-doubling condition makes the two prisms have equal volume.

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