Three angles of a quadrilateral are 75º, 90º and 75º. The fourth angle is

A diagonal of a rectangle is inclined to one side of the rectangle at 25º. The acute angle between the diagonals is

ABCD is a rhombus such that ∠ACB = 40°, then ∠ADB is

The quadrilateral formed by joining the mid-points of the sides of a quadrilateral PQRS, taken in order, is a rectangle, if

The quadrilateral formed by joining the mid-points of the side of quadrilateral PQRS, taken in order, is a rhombus, if

If angles A, B, C and D of the quadrilateral ABCD, taken in order, are in the ratio 3:7:6:4, then ABCD is a

If bisectors of ∠A and ∠B of a quadrilateral ABCD intersect each other at P, of ∠B and ∠C at Q, of ∠C and ∠D at R and of ∠D and ∠A at S, then PQRS is a

D and E are the mid-points of the sides AB and AC of ∆ABC and O is any point on side BC. O is joined to A. If P and Q are the mid-points of OB and OC respectively, then DEQP is

The diagonals AC and BD of a parallelogram ABCD intersect each other at the point 0. If ∠DAC = 32° and ∠AOB = 70°, then ∠DBC is equal to

Which of the following is not true for a parallelogram?

ABCD is a parallelogram. If its diagonals are equal, then find the value of ∠ABC.

In ∆ABC, AB = 5 cm, BC = 8 cm and CA = 7 cm. If D and E are respectively the mid-points of AB and BC, determine the length of DE.

Diagonals of a quadrilateral ABCD bisect each other. If ∠A = 35º, determine ∠B.