## equiangular triangle

### A triangle with 3 congruent angles

An equiangular triangle is a triangle with three congruent angles, that is, each of its angles measures 60 degrees. Because the three angles in an equiangular triangle are equal, each of its sides is also congruent to the others. Therefore, an equiangular triangle is also an equilateral triangle. Conversely, every equilateral triangle is also an equiangular triangle, because its three angles are congruent and each measures 60 degrees. Equiangular triangles are important in geometry because they have special properties related to their angles and sides, and they appear in many applications in mathematics, science, and engineering. For example, equiangular triangles can be used to solve trigonometric problems, to model structures that have uniform distribution of stress and strain, and to design patterns and tessellations in art and architecture.

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