Find the `SI` unit of (i) area, (ii) density, and (iii) momentum.

Explanation

To find the SI units of area, density, and momentum, we will analyze each quantity step by step.

### Step 1: Finding the SI unit of Area
1. **Definition of Area**: Area is defined as the extent of a two-dimensional surface and is calculated as the product of two lengths.
2. **Formula**: Area = Length × Length
3. **SI Unit of Length**: The SI unit of length is the meter (m).
4. **Calculation**: Therefore, the SI unit of area can be expressed as:
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