Question

in a quadrilateral ABCD angle A + angle d equals to 90 degree prove that AC square + BD square = AD square + BC square

Answer 1

Answer:

Step-by-step explanation:

AS shown in the attached diagram, ABCD is a quadrilateral, with ∠A + ∠D = 90°. We are to prove that AC² + BD² = AD² + BC². The sides AB and DC are produced to meet at "P". Hence proved.