To find the perimeter of an equilateral triangle, you simply add up the lengths of all three sides. An equilateral triangle has three sides of equal length, so the perimeter is just three times the length of one side.

For example, if one side of an equilateral triangle measures 5 centimeters, then the perimeter of the triangle is:

Perimeter = 3 x 5 cm = 15 cm

Knowing the perimeter of an equilateral triangle is useful in a variety of situations. For instance, in construction, the perimeter can be used to determine the amount of material needed to build the triangle's frame, such as the length of wood or metal needed for a perimeter fence around an equilateral triangular shaped garden bed.

The formula for determining the perimeter of an equilateral triangle is defined as: