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!