In the given figure, ABCD is a ||gm in which diagonals AC and BD intersect at O. If ar(||gm ABCD) is `52 cm^(2)` then the `ar(triangleAOB)`=?

If ar(||gm ABCD) = 252 cm^2 , then find the area of triangleADB ?

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

In the given figure, ABCD is a ||gm in which DL bot AB . IF AB = 10 cm and DL = 4 cm then the ar(||gm ABCD) = ?

In the adjoining figure, ABCD is a rectangle whose diagonals AC and BD intersect at O. If angle OAB =28^(@), " find " angle OBC.

In trapezium ABCD, AB||CD and AB= (1)/(3)CD . The diagonals AC and BD interset at O. If ar (AOB)= 21 cm^(2) , then find ar (COD).

ABCD is a rectangle. The diagonals AC and BD intersect at O. If AB = 32 cm and AD = 24 cm, then what is OD equal to ?

In the given figure, ABCD is a || gm in which DL bot AB . If AB = 10 cm and DL = 4 cm, then the area of || gm ABCD = ?

In the given figure, ABCD and ABEF are parallelograms such that ar(quad. EABC) 17 cm^(2) and ar(||gm ABCD) = 25 cm^(2) . Then ar(triangleBCF) = ?

In the adjacent figure , ABCD is a rhombus whose diagonals AC and BD intersect at a point O. If side AB=10 cm and diagonal BD=16 cm , find the length of diagonal AC.

ABCD is a quadrilateral whose diagonals AC and BD intersect at O, prove that: (AB+BC+CD+DA)>2(AC+BD)