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On the class of an integer triangle

Published online by Cambridge University Press:  22 June 2022

Emrys Read*
Affiliation:
5 Cefn Cynrig, Bethel, Caernarfon, Gwynedd LL55 1UW e-mail: mairacemrys@btinternet.com

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Any mathematics student who has ever used the cosine rule to investigate simple properties of an integer triangle will immediately have realised that the cosine of each angle of the triangle must be a rational number. It is clear, however, that the same is not in general true for the sines. In [1], it is shown how to use a property of the sines of the angles of an integer triangle to categorise the triangle as being of a particular class. In this article, we develop some of the concepts and results of [1] to derive a method for generating integer triangles of a given class. Finally, we apply our results to find all primitive integer triangles in the particular case of Heronian triangles.

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Articles
Copyright
© The Authors, 2022 Published by Cambridge University Press on behalf of The Mathematical Association