Classifying triangles
The seven types of triangle can be
classified
(grouped) according to their sides or interior angles as shown below. Click on any triangle to go to its detail page.
Classification of triangles by sides



3 sides equal 
2 sides equal 
No sides equal 
Classification of triangles by angles




One angle exactly 90°l 
3 angles equal 
All 3 angles less than 90° 
One angle more than 90° 
Other triangle topics
General
Perimeter / Area
Triangle types
Triangle centers
Congruence and Similarity
Solving triangles
Triangle quizzes and exercises
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