how to construct a parallelogram in which diagonal ac=7.2cm,bd=5cm and also angle between the diagonals is 30 degree?

Answer 1

You know that the diagonals bisect each other
so construct a 30° angle, make one arm 3.6 and the other 2.5
Extend each arm its own length at the 30° angle.
Join the endpoints to finalize the parallelogram.