What is the moment of inertia of a circular disc about one of its diameters ?

Explanation

To find the moment of inertia of a circular disc about one of its diameters, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Problem**: We need to find the moment of inertia (I) of a circular disc about one of its diameters. Let's denote the mass of the disc as \( m \) and its radius as \( r \).

2. **Use Known Moment of Inertia**: The moment of inertia of a circular disc about an axis perpendicular to its plane and passing through the center (let's call this the Z-axis) is given by:
\[
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