Ptolemy Theorem - Proof Without Words
In a cyclic ABCD quadrilateral with sides a, b, c, d, and diagonals e and f, the product of diagonals equals the sum of the products of the opposite sides:
References
- W. Derrick, J. Herstein, Proof Without Words: Ptolemy's Theorem, The College Mathematics Journal, v 43, n 5, November 2012, p 386
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