What is the classification of the triangle?

Answer 1

A triangle can be classified according to its sides or the magnitude of its largest angle (two of the angles MUST be acute angles).

All three sides equal: equilateral. Such a triangle must be equiangular, but that term is rarely used.

Two equal angles, third one different (or two sides equal and third different): isosceles.

All three angles different (all three sides different): scalene.

Largest angle = 90 degrees: A right angled triangle.

Largest angle obtuse: An obtuse angled triangle.