Triangle

Isosceles, Equilateral, and Scalene

Scalene

No equal sides
No equal angles

Equilateral

Three equal sides
Three equal angles, always 60 degress

Isosceles

Two equal sides
Two equal angles

Right

Has a right angle (90 degrees)

Acute

All angles less than 90 degrees

Obtuse

Has an obtuse angle (more than 90 degrees)