ABCD is a rectangle AC is diagonal. Find the nature of `DeltaACD`. Give reasons.

PCl_(5) is ionic in nature in the solid state. Give reasons.

Find the area of the quadrilateral ABCD

ABCD is a rectangle in which diagonals AC bisects angleA as well as angleC , Show that ABCD is a square diagonal BD bisects angleB as well as angleD

Four wires AB, BC, CD, DA of resistance 4 ohm each and fifth wire BD of resistance 8 ohm are joined to form a rectangle ABCD of which BD is diagonal. The effective resistance between the points A and B is

ABCD is a cyclic quadrilateral. Find the angles of the cyclic quadrilateral.

ABCD is a cyclic quadrilateral. Find the angles of the cyclic quadrilateral.

ABCD is a rectangle in which diagonal AC bisects A as well as C. Show that : ABCD is a square

ABCD is a parallelogram, with AC, BD as diagonals. Then vec AC - vec BD =

ABCD is a cyclic quadrilateral. Find the angle A of the cyclic quadrilateral.

In the figure, ABCD is a quadrilateral. AC is the diagonal and DE || AC and also DE meets BC produced at E. Show that ar(ABCD) = ar (DeltaABE).