What is the area of an equilateral triangle with side length x?

The area ( A ) of an equilateral triangle with side length ( x ) can be calculated using the formula ( A = \frac{\sqrt{3}}{4} x^2 ). This formula derives from the properties of equilateral triangles and the use of basic geometric principles. Thus, if you know the side length ( x ), you can easily find the area by substituting it into the formula.