Question

four bodies of mass 1kg, 2kg,3kg, and 4 kg are situated at four corners of a square of side 2m, take the origin at the center of square. find m.i. if the system passing through the centre and perpendicular to the plane of square

Answer 1

You probably mean to ask:
"Find the moment of inertia of the system about an axis passing through the center.."
Each mass is R = sqrt2 meters from the center.

I = (1 + 2 + 3 + 4)*R^2 = 20 kg*m^2