Find the moment of inertia of a circular disc or solid cylinder of radius R about the following axes .
(a) passing through the centre and perpendicular to the flat surface .
(b) at the rim and perpendicular to the flat surface

Explanation

To find the moment of inertia of a circular disc (or solid cylinder) of radius \( R \) about the given axes, we will solve the problem step by step.

### Part (a): Moment of Inertia about the Axis Passing through the Centre and Perpendicular to the Flat Surface

1. **Understanding the Geometry**:
- We have a circular disc of radius \( R \) and mass \( M \).
- We need to find the moment of inertia about an axis that passes through the center and is perpendicular to the flat surface of the disc.

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