Kung S.H. (1990). Proof without Words: The Law of Cosines, Mathematics Magazine, 63 (5) 342. DOI: 10.2307/2690911 (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: 10.2307/2690488 (pdf)
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