AB+CD=AD+BC

In two triangles, ABC and ADC, if AB=AD, BC=CD. Are they congruent?

ABCD is an isoceles trapezium . AB||CD AD=BC diagonal intersect at O, area of ABO = 84 cm^(2) find area of Delta COD

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

In quadrilateral ABCD, AB||CD and BC||AD. Show that (i) DeltaABD~=DeltaCDB

If ABCD is a cyclic quadrilateral, then prove that AC.BD=AB.CD+BC.AD

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

In quadrilateral ABCD, AB = BC = CD = AD and AC ne BD then it is a .....

If four sides of a quadrilateral ABCD are tangential to a circle,then AC+AD=BD+CD(b)AB+CD=BC+AD(c)AB+CD=AC+BC(d)AC+AD=BC+DB

If a,b in N , PQRS is a square and P, Q, R, S are mid points of AB, AD, CD, BC respectively then a+b is