In quadrilateral ABCD, side DC is largest. Show that `AB + AD >DC - BC`.

In a quadrilateral ABCD, vec(AB) + vec(DC) =

In a quadrilateral ABCD, vec(AB) + vec(DC) =

A cyclic quadrilateral ABCD is such that AB = BC, AD = DC, AC bot BD , angleCAD = theta , then the angle angleABC equals___

In quadrilateral ABCD, AB=DC and AD=BC. Prove that the sides AB and DC are parallel to each other.

In quadrilateral ABCD, AB=DC and AD=BC. Prove that the sides AB and DC are parallel to each other.

If the sides of a quadrilateral ABCD touch a circle prove that AB+CD=BC+AD.

If the sides of a quadrilateral ABCD touch a circle prove that AB+CD=BC+AD.

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