Classification of triangles from angles:
-Acute triangle: 3 acute triangles
-Equiangular triangle: 3 congruent acute angles, special kind of acute triangles
-Obtuse triangle: 1 obtuse angle
-Right triangle: 1 right angle
Classification of triangles from sides:
-Equilateral triangle: 3 congruent sides
-Isosceles triangle: at least 2 congruent sides
-Scalene triangle: no congruent sides