# Proposition 7, Book XII, Euclid's *Elements*

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This Demonstration dynamically illustrates Proposition 7, Book XII of Euclid's *Elements*.

Contributed by: Izidor Hafner (May 2008)

Open content licensed under CC BY-NC-SA

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Proposition 7, Book XII of Euclid's *Elements* states: Any prism which has a triangular base is divided into three pyramids equal to one another which have triangular bases [2]. ("Equal" means "have the same volume".)
[1] D. E. Joyce, "Euclid's *Elements*: Introduction."
[2] Euclid, *Elements*, T. L. Heath, trans., as *The Thirteen Books of Euclid’s Elements*, 2nd ed., Book 3, New York: Dover Publications, 1956 p. 394.

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