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

In a parallelogram ABCD the value of 

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

The diagonals of  a ________ are equal.

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

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

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

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

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