Proposition·Untested·2605.00009

Proposition XI.29

Parallelepipedal solids which are on the same base and of the same height, and in which the extremities of the sides which stand up are on the same straight lines, are equal to one another.

Proof

The two parallelepipeds can be decomposed into congruent prisms via XI.28 and I.34 applied repeatedly; the equality is the 3D analogue of I.35 (parallelograms on the same base between the same parallels).

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