Prove that the angle AED is not acute
Source: Tournament of Towns Spring 2003 - Junior A-Level - Problem 6
June 14, 2011
geometrytrapezoidinequalitiesgeometric transformationreflectiontriangle inequalitygeometry unsolved
Problem Statement
A trapezoid with bases and is circumscribed about a circle, is the intersection point of the diagonals. Prove that is not acute.