# Scalene Triangles (Mathematics Glossary)

# What Is a Scalene Triangle?

A scalene triangle is a triangle where none of the sides or angles are equal.#### Dictionary Definition

The Merriam-Webster dictionary defines a scalene triangle as "having the three sides of unequal length."# Real Examples of Scalene Triangles

Below are real examples of scalene triangles.In each case

- No sides are the same length
- No angles are the same (60°)

##### Curriculum

##### Interactive Test

**show**

Here's a second test on scalene triangles.

Here's a third test on scalene triangles.

##### Note

# What's in a Name?

'Scalene' comes from the Greek word 'skalenos', meaning 'unequal'.# Interior Angles of a Scalene Triangle

The interior angles of any triangle add up to 180°.In a scalene triangle, the angles are all different.

# Symmetry of a Scalene Triangle

A scalene triangle has no lines of symmetry.# Other Types of Triangle

Scalene triangles are one type of triangle.There are also:

- Equilateral triangles (with 3 equal sides and angles)
- Isosceles triangles (with 2 equal sides and angles)