Question

find the perimeter of an equilateral triangle that has sides with lengths of 13 millimeters. the perimeter of the equilateral triangle is

Explanation:

Step1: Recall the property of an equilateral triangle

In an equilateral triangle, all three sides are equal.

Step2: Use the perimeter formula

The perimeter \(P\) of a triangle is \(P=a + b+ c\). For an equilateral triangle with side length \(s\), \(P = 3s\) (since \(a=b = c=s\)). Given \(s = 13\) millimeters.
Substitute \(s=13\) into the formula: \(P=3\times13\).

$$P = 3\times13=39$$

Answer:

39