equilateral
all sides and angles are the equal; all angles are 60
isosceles
2 sides and angles are equal
2 kinds of special right triangles
3:4:5 and 5:12:13 including multiples of each
right angles
have 90 angle which is directly across from the hypotenuse
able to use the pythagorean theorum
45:45:90
isosceles right triangle
side lengths are 1:1:sqrt2
formed when a square is divided in half diagonally
30:60:90
side lengths are 1:sqrt3:2
formed when an equilateral triangle is divided in half