Why is it wrong?

Question

https://code.sololearn.com/cPc3uzPAb5w0/?ref=app

Answer 1

First, your implementations must be different, the calculation for the circle is wrong.

Then remove these lines:
Area = area;
area = rect;
area = cir;
And get directly your variables rect and circ in the println.

Good practice : we often try to instantiate the object by declaring the most abstract parent :
Area cir = new Circle()
Area rect = new Rectangle()
It allows to have for example a list of Areas or a method waiting for an Area whatever the implementation