Question

A uniform wire of length (l)and mass (m) bent in shape of semi circle of radius (r) calculatemass of inertia about its diameter

Answer 1

this is to be correct

Answer 2

length of the wire l = πr , e.i, r=l/π

wire after bending will take shape of a half ring whose base will give us the moment of inertia about its diameter

                                  moment of inertia of a ring about it's diameter = Mr^2/2  

                                                                                                                   

      = $Ml^2 / 2\pi^2$

:)