ABCD is a parallelogram then A - C= 

Number of independent measurements required for the construction of a quadrilateral. 

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

Each angle is a rectangle is 

The sum of the lengths of all the four sides of a quadrilateral is called its

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

The diagonals of  a ________ are equal.

In a rectangle ABCD, the diagonal AC = 10 cm then the diagonal BD =

In a parallelogram ABCD the value of 

Sum of exterior angles of a quadrilateral in right angles