Find the area of metal sheet required in making a closed hollow cone of base radius 7cm and height 24cm.

Explanation

To find the area of the metal sheet required to make a closed hollow cone, we need to calculate the total surface area of the cone, which includes the lateral surface area and the area of the base.

### Step 1: Identify the given values
- Base radius (r) = 7 cm
- Height (h) = 24 cm

### Step 2: Calculate the slant height (l) of the cone
The slant height can be calculated using the Pythagorean theorem:
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