MathDB
isosceles wanted, equilateral on square given

Source: Germany Federal - Bundeswettbewerb Mathematik 2012, round 1, p3

April 11, 2020
geometryisoscelesEquilateral TriangleEquilateral

Problem Statement

An equilateral triangle DCEDCE is placed outside a square ABCDABCD. The center of this triangle is denoted as MM and the intersection of the straight line ACAC and BEBE with SS. Prove that the triangle CMSCMS is isosceles.
Back to ProblemsView on AoPS