In a quadrilateral `AB|\|CD` the diagonals intersect at ‘O’. Then S.T. `/_\OAB` ~ `/_\OCD`.

In a rhombus ABCD, its diagonal intersects at ‘O’. then /_AOB= …………degrees.

If a quadrilateral ABCD, the bisector of angleC angleD intersect at O. Prove that angleCOD=(1)/(2)(angleA+angleB)

ABCD is a parallelogram. AC and BD are the diagonals intersect at O. P and Q are the points of tri section of the diagonal BD. Prove that CQ" ||" AP and also AC bisects PQ (see figure).

BASE is a rectangle. Its diagonals intersect at O. Then Find the value of x , if OB=5x+1 and OE=2x+4 .

The diagonals of a quadrilateral ABCD intersect each other at point'O' such that (AO)/(BO)=(CO)/(DO) . Prove that ABCD is a trapezium.

ABCD is a trapezium in which AB|\|DC and its diagonals intersect each other at point ‘O’. Show that (AO)/(BO)=(CO)/(DO) .

ABCD is a trapezium in which AB||DC the diagonals AC and BD are intersecting at E. IF DeltaAED is similar to DeltaBEC , then prove that AD=BC.

In parallelogram ABCD, its diagonals overline (AC) and overline (BD) intersect at O. if AO=5cm then AC= ……… cm .