The height and the slant height of a cone are `21 cm` and `28 cm` respectively. Find the volume of the cone.

Explanation

To find the volume of the cone with a height of 21 cm and a slant height of 28 cm, we will follow these steps:

### Step 1: Identify the given values
- Height (h) = 21 cm
- Slant height (l) = 28 cm

### Step 2: Use the Pythagorean theorem to find the radius (r)
The relationship between the radius (r), height (h), and slant height (l) of a cone is given by the formula:
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