In a hot water heating system, there is a cylindrical pipe of length 28 m and diameter 5 cm. Find the total radiating surface in the system.

Explanation

To find the total radiating surface area of a cylindrical pipe in a hot water heating system, we will follow these steps:

### Step 1: Identify the given values
- Length of the cylindrical pipe (height, H) = 28 m
- Diameter of the cylindrical pipe = 5 cm

### Step 2: Convert the diameter to radius in meters
- Radius (R) = Diameter / 2 = 5 cm / 2 = 2.5 cm
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