Information: The upper $($hollow$!)$ semicircle has the radius r and the mass M$.$ It rotates around its right edge point about the axis $($the red line, see Figure$)$ parallel to the axis Y$.$ Question$)$ Found the moment of inertia I of the semicircle about the actual axis of its rotation $($the red line in Figure$).$ In short, find the moment of inertia of our hollow shape as it rotates around the red line.