Proof of Proposition 28, Book XI, Euclid's Elements
 The blue and the orange prisms are only symmetrical; to prove that they are equivalent, certain propositions are needed [2]. [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 pp. 332–333.   "Proof of Proposition 28, Book XI, Euclid's Elements" from The Wolfram Demonstrations Project http://demonstrations.wolfram.com/ProofOfProposition28BookXIEuclidsElements/ Contributed by: Izidor Hafner | ||||||||||||||
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