" 36.In a trapezium "ABCD" ,if "AB|CD" then "(AC^(2)+BD^(2))=?

ABCD is a trapezium in which AB||CD then AC^(2)+BD^(2) is equal to

In a rhombus ABCD, prove that AC^(2) + BD^(2) = 4AB^(2)

In a rhombus ABCD, prove that AC^(2) + BD^(2) = 4AB^(2)

For a rhambus ABCD , prove that 4 AB ^(2) = AC^(2) + BD^(2)

In a trapezium ABCD , it is given that AB||CD and AB= 2CD . Its diagonals AC and BD intersect at the point O such that ar (Delta AOB)=84 cm^(2) . Find ar (Delta COD)

In the rhombus ABCD, AB = 6 cm, then find AC^2 + BD^2 .

In the trapezium ABCD, AB || DC. The diagonals AC and BD of it intersects each other at O. Prove that DeltaAOD=DeltaBOC.

In trapezium ABCD, AB||CD and AB= (1)/(3)CD . The diagonals AC and BD interset at O. If ar (AOB)= 21 cm^(2) , then find ar (COD).

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