Describe what you know about an equilateral triangle in 2 complete sentences

An equilateral triangle is a triangle where all the sides are equal and all the interior angles are of 60 °. The example of the equilateral triangle is a regular polygon.

Explanation:

As the equilateral triangle has all three sides the same size, it is needed one length of one side and we can calculate the perimeter. As the angles are of 60 ° the sum of all angles is 180°.