Field of Science

Proofs without words: Ptolemy's theorem and cosine's law

Derrick W. & Hirstein J. (2012). Proof Without Words: Ptolemy’s Theorem, The College Mathematics Journal, 43 (5) 386-386. DOI: (via Cut the Knot)
Kung S.H. (1990). Proof without Words: The Law of Cosines, Mathematics Magazine, 63 (5) 342. DOI: (pdf)
Law of cosines via Ptolemy's theorem
Kung S.H. (1992). Proof without Words: The Law of Cosines via Ptolemy's Theorem, Mathematics Magazine, 65 (2) 103. DOI: (pdf)

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