integer right triangle on lattice points has incenter a lattice point
Source: 1991 German Federal - Bundeswettbewerb Mathematik - BWM - Round 1 p3
November 20, 2022
geometryincenterlattice points
Problem Statement
In a plane with a square grid, where the side length of the base square is , lies a right triangle. All its vertices are lattice points and all side lengths are integer. Prove that the center of the incircle is also a lattice point.