A right triangle on an Euclidean plane is a triangle on an Euclidean plane where two of its angles are acute angles? and the third angle is a right angle.
John Baez, The Moduli Space of Acute Triangles, Notices of the American Mathematical Society, Volume 71, Number 5, pages 664-665, May 2024. (arXiv:2407.06201, pdf)
Wikipedia, Right triangle
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