A rational sine and cosine of the angles of a triangle
Articles
Edmundas Mazėtis
Lietuvos edukologijos universitetas
Grigorijus Melničenko
Lietuvos edukologijos universitetas
Published 2013-12-20
https://doi.org/10.15388/LMR.B.2013.28
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Keywords

Pythagorean triangles
Heronian triangles
Pythagorean angles
sines
cosines

How to Cite

Mazėtis E. and Melničenko G. (2013) “A rational sine and cosine of the angles of a triangle”, Lietuvos matematikos rinkinys, 54(B), pp. 151–154. doi: 10.15388/LMR.B.2013.28.

Abstract

The article deals with triangles whose sines and cosines of the angles are the rational numbers. We prove that these triangles are similar to Pythagorean or Heronian triangles, and vice versa.

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