###
Acute Triangle

a triangle with three acute angles

###
Obtuse Triangle

a triangle with one obtuse angle

###
Right Triangle

a triangle with one right angle

###
Equiangular Triangle

a triangle with three acute angles that are all 60 degrees

###
Scalene Triangle

a triangle with no congruent sides

###
Isosceles Triangle

A triangle with at least two congruent sides

###
Equilateral Triangle

a triangle with three congruent sides

###
Legs

the two congruent sides of an isosceles triangle or the two sides that form a right angle

###
Hypotenuse

the side of a right triangle opposite the right angle

###
Base

the non-congruent side of an isosceles triangle

###
Base Angles

the two angles opposite the legs; they are congruent

###
Vertex Angle

the angle opposite the base in an isosceles triangle

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