Heronian triangles

Authors

  • Jaroslav Zhouf Faculty of inforrmation technology, CTU in Prague

Abstract

The article deals with so-called Heronian triangles, i.e., triangles with integer side lengths and integer areas. It is based on the task of finding all such triangles for which there is a positive ratio between the numerical value of the area and the perimeter. The author presents a method that converts the problem into finding integer solutions to a certain equation and, thanks to simple estimates, significantly narrows down the set of possible solutions, making it possible to perform a complete (or at least verifiable) enumeration of solutions for selected ratio values. For several specific cases, he lists the resulting sets of triangles and comments on when "classic" right-angled triangles appear among them. At the same time, he openly admits the limitations: for some values of the ratio, the number of candidates grows rapidly, and it is advisable to rely on computational verification; and the claim that the number of these triangles increases with the ratio remains unproven. In conclusion, it is suggested that a similar procedure can be used for irrational ratios, and several examples are given.

Published

2026-02-28

How to Cite

Zhouf, J. (2026). Heronian triangles. MATHEMATICS–PHYSICS–INFORMATICS, 35(1), 11–16. Retrieved from https://www.mfi.upol.cz/index.php/mfi/article/view/1072

Issue

Section

Mathematics