Calculate the Perimeter: Equilateral Triangle with 5-Unit Sides

To solve this problem, we'll follow these steps:

• Step 1: Identify the side length of the equilateral triangle, which is given as $5$.
• Step 2: Use the formula for the perimeter of an equilateral triangle: $\text{Perimeter} = 3 \times \text{side length}$.
• Step 3: Substitute the given side length into the formula and calculate the perimeter.

Now, let's work through each step:
Step 1: The side length of triangle ABC is $5$.
Step 2: The perimeter formula for an equilateral triangle is $3 \times s$, where $s$ is the side length.
Step 3: Plugging in the side length, we get:
$\text{Perimeter} = 3 \times 5 = 15$

Therefore, the perimeter of triangle ABC is $15$.