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

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

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

If in a cyclic quadrilateral ABCD, AB=DC , then prove that AC=BD

In the quadrilateral ABCD, AB=BC and AD=DC Measure of angleBCD is . . . . . . .

ABCD is a quadrilateral in which AB||DC and AD = BC. Prove that angleA=angleB and angleC= angleD .

ABCD is a quadrilateral in which AB||DC and AD = BC. Prove that angleA=angleB and angleC= angleD .

In a quadrilateral ABCD, it is given that AB ||CD and the diagonals AC and BD are perpendicular to each other. Show that AD.BC >= AB. CD.

In a quadrilateral ABCD, it is given that AB |\|CD and the diagonals AC and BD are perpendicular to each other. Show that AD.BC >= AB. CD .

In a quadrilateral ABCD, it is given that AB |\|CD and the diagonals AC and BD are perpendicular to each other. Show that AD.BC >= AB. CD .