[" 39.In a quadrilateral "ABCD,/_A+/_D=90^(@)" .Prove that: "],[qquad AC^(2)+BD^(2)=AD^(2)+BC^(2)]

In a quadrilateral ABCD,/_A+/_D=90^(@). Prove that AC^(2)+BD^(2)=AD^(2)+BC^(2)

In a quadrilateral ABCD, angleA+angleD=90^(@) . Prove that AC^(2)+BD^(2)=AD^(2)+BC^(2)

In a quadrilateral ABCD, angleA+angleD=90^(@) . Prove that AC^(2)+BD^(2)=AD^(2)+BC^(2)

In a quadrilateral ABCD angle B = angle D = 90 ^(@) Prove that : 2AC^(2) - BC^(2) = AB^(2) + AD^(2) +DC^(2)

In a quadrilateral ABCD, angleB=90^(@) and angleD=90^(@) . Prove that : " "2AC^(2)-AB^(2)=BC^(2)+CD^(2)+DA^(2)

In a quadrilateral ABCD, /_B= 90^(@)" and "AD^(2)= AB^(2)+BC^(2)+CD^(2) . Prove that /_ACD= 90^(@) .

In Delta ABC, AD_|_ BC . Prove that AB^(2) - BD^(2) =AC^(2) -CD^(2)

In AD bot BC , prove that AB^(2)+CD^(2)=BD^(2)+AC^(2)

In a quadrilateral ABCD,/_B=90oAD^(2)=AB^(2)+BC^(2)+CD^(2), prove that /_ACD=90o

In a rectangle ABCD, prove that : AC^(2)+BD^(2)=AB^(2)+BC^(2)+CD^(2)+DA^(2) .