Let's look at the geometric characteristics of an equilateral triangle. But first, please review the definition of Area Of Two-Dimensional Shapes, and Angle.

- An equilateral triangle has two unique features.
- The first unique feature - all three sides of the triangle
are exactly the same length. In this example sides
**A**are of equal length. - The second unique feature of an equilateral triangle are the interior angles are exactly 60°. The sum of the interior angles is 180°.
- Special note, all sides of an Equilateral Triangle must be greater than zero.

**Area Of An Equilateral Triangle Formula**

Formula = (√3 ÷
4) × SideA^{2} =

Formula = √ 3 × 0.25 × SideA^{2} =

Formula = 1.73205080 × 0.25 × SideA^{2} =

Formula = 0.4330127 × A^{2}