Triangles can be classified according to the lengths of their sides and the measures of their angles:
By Side Length
- Scalene: All three sides are different lengths.
- Isosceles: Two sides are the same length.
- Equilateral: All three sides are the same length.
By Angle Measure
- Acute: All three angles are less than 90 degrees.
- Right: One angle is 90 degrees.
- Obtuse: One angle is greater than 90 degrees.
The following table summarizes the different types of triangles:
Side Length | Angle Measure | Example |
Scalene | Acute | |
Isosceles | Right | |
Equilateral | Obtuse |
Another summary of Triangles classified by side length and angle measure.