A parallelogram in which one angle is 90^o and two adjacent sides are equal is a 

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

In a parallelogram ABCD the value of 

Each angle is a rectangle is 

In a rhombus ABCD, its diagonals intersect at 'O'. Then AOB= 

ABCD is a parallelogram then A - C= 

A parallelogram in which two adjacent sides are equal is a 

Sum of the angles in a quadrilateral in right angles. 

ABCD is a parallelogram  

In parallelogram ABCD, its diagonals intersect at 'O'. If AO= 5 cm then AC=