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To find the perimeter of the given semicircle, we need to consider two components:

1. **The curved part (half of the circle's circumference)**.
2. **The straight part (the diameter of the semicircle)**.

### Step 1: Calculate the circumference of the full circle
The formula for the circumference of a circle is:
\[
C = 2 \pi r
\]
Where \(r\) is the radius.

Given that the diameter is 6.8 meters, the radius \(r\) is:
\[
r = \frac{6.8}{2} = 3.4 \, \text{meters}
\]

Thus, the full circumference of the circle is:
\[
C = 2 \pi (3.4) = 6.8 \pi \approx 21.36 \, \text{meters}
\]

### Step 2: Calculate the curved part of the semicircle
Since the semicircle is half of the circle, the curved part is:
\[
\text{Curved part} = \frac{21.36}{2} \approx 10.68 \, \text{meters}
\]

### Step 3: Add the straight part (the diameter)
The straight part is just the diameter, which is 6.8 meters.

### Step 4: Total perimeter
The perimeter of the semicircle is the sum of the curved part and the straight part:
\[
\text{Perimeter} = 10.68 + 6.8 = 17.48 \, \text{meters}
\]

Thus, the correct answer is:
\[
\boxed{D: 17.48 \, \text{m}}
\]

Would you like more details or have any questions?

Here are five related questions:
1. How do we calculate the area of a semicircle?
2. What is the difference between the perimeter and circumference of a shape?
3. How does the perimeter of a semicircle change with varying diameters?
4. What is the relationship between radius and diameter in any circle?
5. How can we approximate \(\pi\) more accurately for precision?

**Tip:** Always break down complex shapes into simpler components like straight and curved sections when calculating perimeters or areas.

The perimeter of this semicircle, correct to two decimal places, is:

Calculate the perimeter of a semicircle with a diameter of 6.8 meters using the formula for the circumference of a circle. This problem demonstrates the step-by-step solution and is suitable for Grades 6-8.

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