Is quadrilateral ABCD a ||gm?
I. Diagonals AC and BD bisect each other.
II. Diagonals AC and BD are equal.
The correct answer is : (a) /(b)/(c )/(d).

Is quadrilateral ABCD a rhombus ? I. Quadrilateral ABCD is a ||gm. II. Diagonals AC and BD are perpendicular to each other. The correct answer is : (a) /(b)/(c )/(d).

Is ||gm ABCD a square? I. Diagonals of ||gm ABCD are equal. II. Diagonals of ||gm ABCD intersect at right angles. The correct answer is : (a) /(b)/(c )/(d).

If ABCD is a quadrilateral whose diagonals AC and BD intersect at O, then

In quadrilateral ABCD, diagonal BD is bisected by the diagonal AC. Prove that : Delta ABC and Delta ADC are equal in area.

In a quadrilateral ABCD, with unequal sides if the diagonals AC and BD intersect at right angles, then

In the cyclic quadrilateral ABCD , the diagonal BD bisects the diagonal AC . Prove that ABxxAD=CBxxCD .

The diagonals of quadrilateral ABCD, AC and BD intersects at O. Prove that if BO = OD then the triangles ABC and ADC are equal in area.

In quadrilateral ABCD, diagonals AC and BD intersect at point E such that AE : EC = BE : ED . Show that : ABCD is a trapezium.

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.