sides, and angles
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as scalene, equilateral and isoceles.
Some triangles can be classified by only term, and some triangles fall into two overlapping, non-mutually-exclusive categories.
Triangles can be classified by their sides: equilateral, isosceles, scalene or by their angles: acute, right, obtuse. Combinations are possible.
Equilateral, Isosceles and Scalene are three types of triangles classified based on how many congruent sides the triangle has.
Triangles can be classified by their sides or their angles. When classifying them by their angles, triangles are called: acute triangles - all three angles are acute (less than 90º) right triangles - one right angle (90º) and two acute angles obtuse triangles - one obtuse angle (larger than 90º) and two acute angles