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Classifications by side length or comparison of angles and sides:

scalene - no sides or angles equal

isosceles - two sides and angles equal (congruent)

equilateral - all sides and angles equal (all 60° angles)

Classifications by included angles :

right triangle - contains a 90° angle (right angle)

oblique triangle - has no right angle

acute triangle - contains all angles less than 90°

obtuse triangle - contains one angle greater than 90°

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