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97.26 The cosine rule in three dimensions and de Gua's theorem

Published online by Cambridge University Press:  23 January 2015

Rasul A. Khan
Rasul A. Khan*
Affiliation:
Cleveland State University, OH 44115, USA e-mail:, r.khan@csuohio.edu
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Abstract

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Type
Notes 97.17 to 97.38
Information
The Mathematical Gazette , Volume 97 , Issue 539 , July 2013 , pp. 281 - 284
Copyright
Copyright © The Mathematical Association 2013

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References

1. Khyfits, Alexander, The theorem of cosines for pyramids, The College Mathematics Journal 35 No.5 (2004) pp. 385–388.Google Scholar
2. Klaine, Daniel A., An intuitive proof Heron's formula, Amer. Math. Monthly, 111 (2004) pp. 709–712.CrossRefGoogle Scholar
3. Quadrat, Jean-P., Lasserre, Jean B., and Hiria, Jean-B.: Pythagoras' Theorem for Areas, Amer. Math. Monthly, 108 (2001) pp. 549–551.CrossRefGoogle Scholar
4. De Gua's Theorem, http://en.wikipedia.org/wiki/De_Gua's_theorem Google Scholar