3.
If the diagonals of a quadrilateral bisect each other at right angles, then it is a :-
4.
The figure formed by joining the mid points of the adjacent sides of a quadrilateral is a :-
6.
The bisectors of any two adjacent angles of a parallelogram intersect at :-
9.
If an angle of parallelogram is two-third of its adjacent angle, the smallest angle of the parallelogram is
10.
In which of the following is the lengths of diagonals equal?
