MathDB
Easy geometry

Source: South Africa 2002

October 13, 2005
geometrytrigonometryvectoranalytic geometrytrig identitiesLaw of Cosines

Problem Statement

Given a quadrilateral ABCDABCD such that AB2+CD2=AD2+BC2AB^2 + CD^2 = AD^2 + BC^2, prove that AC⊥BDAC \perp BD.
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