Perimeter of an Equilateral Triangle

To find the perimeter of an equilateral triangle, we need to know the length of one side of the triangle. In this case, the side length is given as 20 cm.

Definition of an Equilateral Triangle
An equilateral triangle is a special type of triangle where all three sides are equal in length. Additionally, all three angles of an equilateral triangle are also equal and measure 60 degrees.

Formula for Perimeter of an Equilateral Triangle
The formula to calculate the perimeter of an equilateral triangle is:
Perimeter = 3 x Side Length

Given Information
Side Length = 20 cm

Calculation
Using the formula for the perimeter of an equilateral triangle, we can substitute the given side length into the equation and solve for the perimeter:

Perimeter = 3 x 20 cm
Perimeter = 60 cm

Therefore, the perimeter of an equilateral triangle with a side length of 20 cm is 60 cm.

Explanation
An equilateral triangle is a triangle with all three sides equal in length. In this case, the side length is given as 20 cm. The perimeter of any shape is the total length of all its sides.

To calculate the perimeter of an equilateral triangle, we can use the formula: Perimeter = 3 x Side Length. Substituting the given side length of 20 cm into the formula, we get: Perimeter = 3 x 20 cm = 60 cm.

Thus, the perimeter of the equilateral triangle is 60 cm. This means that if we were to measure the length of all three sides and add them together, we would get a total length of 60 cm.