Types of Triangles with Algebra

Congruence:
Scalene: 0 congruent sides/angles
Isosceles: 2 congruent sides/angles
Equilateral: 3 congruent sides/angles
Angles:
Acute: 3 acute angles (less than 90)
Right: 1 right angle (90) and 2 acute angles
Obtuse: 1 obtuse angle (more than 90) and 2 acute angles