In a quadrilateral ABCD, &ang;B = 90° and &ang;D = 90°. Prove that : 2AC² - AB² = BC² + CD² + DA². Created by GoldenSparks.

In a quadrilateral ABCD, ∠B = 90° and ∠D = 90°. Prove that : 2AC²

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In a quadrilateral ABCD, ∠B = 90° and ∠D = 90°. Prove that : 2AC² - AB² = BC² + CD² + DA²