Top surface of a raised platform is in the shape of a regular octagon as shown in the figure. Find the area of the octagonal surface.

Explanation

To find the area of the octagonal surface of the raised platform, we can break the problem down into manageable steps. Here’s a step-by-step solution:

### Step 1: Understand the Shape
The top surface of the raised platform is a regular octagon. A regular octagon has eight equal sides and equal angles.

### Step 2: Identify the Dimensions
From the problem, we know:
- Each side of the octagon (ab, bc, cd, etc.) is 5 meters.
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