https://file.aiquickdraw.com/mathbot/file/17277956586121icjltqq.jpg

To solve this problem, we need to find the missing side length, given that the total perimeter of the figure is 39.9 feet.

The sides of the figure that are already provided are:
- 3 sides of 5.3 feet each (which are three sides)
- 2 sides of 3.9 feet each.

The perimeter is the sum of all the side lengths. Let’s add up the known sides first:

\[
\text{Sum of known sides} = 3 \times 5.3 + 2 \times 3.9
\]
\[
\text{Sum of known sides} = 15.9 + 7.8 = 23.7 \text{ feet}
\]

Now, the total perimeter is 39.9 feet, so the missing side, denoted as "?", can be found by subtracting the sum of the known sides from the total perimeter:

\[
\text{Missing side} = 39.9 - 23.7 = 16.2 \text{ feet}
\]

Thus, the length of the missing side is **16.2 feet**.

Would you like further clarification or details on this? 

Here are 5 related questions to think about:
1. How would the answer change if the total perimeter was different?
2. What formula is used to calculate the perimeter of any polygon?
3. How can we verify that the missing side calculation is correct?
4. What would happen if two sides were missing? How would you solve that?
5. How could this concept be applied to more complex shapes?

**Tip:** Always check if the sum of known sides and the missing side equals the total perimeter to verify your answer.

The perimeter of the figure below is 39.9 ft. Find the length of the missing side.

This problem asks students to find the length of a missing side of a polygon when the total perimeter is 39.9 ft. It involves using basic perimeter calculations and algebra to solve for the unknown side. Suitable for students in Grades 6-8.

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