Trachea is lined with incomplete rings of

Trachea is double in -

Trachea is present in

Trachea are found in

Trachea has complete covering of cartilag rings.

From a complete ring of mass M and radius R , a 30^@ sector is removed. The moment of inertia of the incomplete ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is ,

From a complete ring of mass M and radius R, a sector angle is removed. What is the moment of inertia of the incomplete ring about axis passing through the center of the ring and perpendicular to the plane of the ring?