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Let's analyze the problem.

### Given:
- The garden is a triangular shape, and its **perimeter is 36 feet**.
- The sides of the triangle are:  
  - 15 feet,  
  - 5 feet,  
  - 3 feet,  
  - And one unknown side, which we need to find (denoted as "? ft").

### Solution:
The perimeter of a triangle is the sum of all its sides. So:

\[
P = 15 \, \text{ft} + 5 \, \text{ft} + 3 \, \text{ft} + \text{? ft}
\]

Since the total perimeter is 36 feet, we can set up the equation:

\[
15 + 5 + 3 + ? = 36
\]

Simplify:

\[
23 + ? = 36
\]

Now, solve for the unknown side:

\[
? = 36 - 23 = 13 \, \text{feet}
\]

Thus, the missing side is **13 feet**.

---

Would you like further details, or do you have any questions? Here are 5 related questions for practice:

1. How do you calculate the perimeter of any polygon?
2. What is the difference between the perimeter and area of a shape?
3. If one side of the triangle were increased by 2 feet, how would the perimeter change?
4. How would you solve for an unknown side if given angles and one side of a right triangle?
5. Can the triangle inequality theorem help in verifying the side lengths?

**Tip:** Always ensure that the sum of any two sides of a triangle is greater than the third side—this is called the triangle inequality theorem.

Your garden has a perimeter of 36 feet. What is the length of the missing side?

Learn how to find the missing side of a triangle when the perimeter is 36 feet. This problem involves basic geometry concepts such as calculating the perimeter of a polygon and applying the triangle inequality theorem. Suitable for students in Grades 5-6.

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