Rotational motion

The correct answer is Ml^2/2pi^2. Where am I going wrong?

@sarahkhan
the formule you have used has M for for complete ring. here the half ring has mass M

@sarahkhan could u upload question I can't understand weather it's semi ring or disk

@kdsdhaniksamba it's semiring

@kdsdhaniksamba The question is :
A uniform wire of length l and mass M is bent in the shape of a semicircle of radius r. Calculate moment of inertia about XX'

@sarahkhan it was nothing but mr^2 as mass was at distance r from every point so find r
Is same ring