It has 3 congruent sides
It has one angle of 90°
It has one angle bigger than 90° but less than 180°
It has 3 angles, 3 sides, and 3 vertices
It has 2 congruent sides
Isosceles triangle
It has 3 different sides
Equilateral triangle
Triangle
It has 2 congruent sides and 1 angle of 90°
Acute triangle
Right triangle
Isosceles rigth triangle
Obtuse triangle
Scalene triangle
It has 3 angles less than 90°