The area of an equiangular triangle can be calculated in the usual way, but in this special case of an equilateral triangle, it is also given by the formula: where S is the length of any one side. For an equiangular triangle, the radius of the incircle is exactly half the radius of the circumcircle . It is not equilateral if the sides are not equal in length. So, it might be similar to another equiangular triangle, but not congruent. But, all equilateral triangles are equiangular. All equiangular triangles are similar, but not all of them are congruent, which means they do not all have corresponding side lengths. A triangle with all angles equal (they are all 60°) All sides are also equal. If a triangle is equiangular, it will have all equal angles.

The same as an Equilateral Triangle.

Every equilateral triangle has three 60-degree angles inside the triangle, and three 120-degree angles outside the triangle.