Find (i) the curved surface area and (ii) the total surface area of a hemisphere of radius 21 cm.

Explanation

To solve the problem of finding the curved surface area and the total surface area of a hemisphere with a radius of 21 cm, we can follow these steps:

### Step-by-Step Solution

**Step 1: Identify the radius of the hemisphere.**
- Given radius \( r = 21 \) cm.

**Step 2: Calculate the curved surface area (CSA) of the hemisphere.**
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