निम्न बहुपदों के गुणनखण्ड कीजिए - `ab+cd+ad+bc`

ABCD is a trapezium in which AB abs CD and AD = BC. Show that A=B

Two lines AB and CD intersect at O such that BC is equal and parallel to AD. Prove that the lines AB and CD bisect at O.

Two lines AB and CD intersect at O such that BC is equal and parallel to AD .Prove that the lines AB and CD bisect at O

ABCD is a trapezium . AB ||CD and AB : CD = 5 : 4 , E and F are mid points of AD and BC, if CD= 20 cm , Find EF

ABCD is a trapezium is which AB || CD and BC _|_ AB . If AB = 7.5 cm , AD = 13 cm and CD = 12.5 cm , find the length of BC.

ABCD is a trapezium such that AB and CD are parallel and BC bot CD . If /_ADB=theta , BC=p and CD=q , then AB is equal to