Classifying Triangles

Triangles can be classified by their angles and/or side lengths. Use the chart below to help you name triangles.

Classify by the lengths of their sides Classify by the measures of their angles
Equilateral has 3 congruent sides A Right triangle has 1 right angle
Isosceles has 2 congruent sides An Acute triangle has 3 acute angles
Scalene has no congruent sides An Obtuse triangle has 1 obtuse angle

right angle = exactly 90º
acute angle = more than 0º but less than 90º
obtuse angle = more than 90º but less than 180º
straight angle = exactly 180º

Click HERE for more help on this!

Leave a Comment