# Question #8a776

##### 1 Answer

Nov 29, 2017

**Definition**: The **radius-of-gyration** is defined such that, for any geometry, the **moment-of-inertia** (

[1] **Circular Disc**: For a circular disc of mass

[a] Its moment-of-inertia for rotation about an axis passing through its centre and perpendicular to its plane is -

[b] Its moment-of-inertia about an axis passing through its centre and parallel to its plane is -