The three angles of a quadrilateral are 50^o, 70^o, 120^o. Find the fourth angle.

Sum of exterior angles of a quadrilateral in right angles 

In a parallelogram ABCD the value of 

In trapezium ABCD, 

A quadrilateral which has one pair of opposite sides parallel is called a

The quadrilateral in which the diagonals bisect each other and they are perpendicular to each other. 

Each angle is a rectangle is 

A parallelogram in which two adjacent sides are equal is a 

The name of the quadrilateral in which the diagonals are equal and perpendicular to each other. 

If the diagonal AC, BD of a parallelogram meet at O, then