Triangle whose three sides are congruent.
Property
A triangle is an equilateral triangle if its three angles are congruent and they all measure 60°.
Formula
The formula to calculate the area A of an equilateral triangle is: \(A=\frac{c^{2}}{4}\sqrt{3}\)
The formula to calculate the radius r of the circle circumscribed about an equilateral triangle is: \(r=\frac{c}{3}\sqrt{3}\)
The formula to calculate the radius r of the circle inscribed in an equilateral triangle is: \(r=\frac{c}{6}\sqrt{3}\)
Example
This is an equilateral triangle:
