# Classifying Triangles and Angle Measures in Triangles

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### 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

Example: