Classifying Triangles by Interior Angles

In our study of Measurement we learned that we there were numerous different types of angles.  For a review click here.

Using this previous knowledge, we can classify triangles by their interior angles.  There are three types of angles we can classify this way:

  • Right Triangles
  • Obtuse Triangles
  • Acute Triangles

A right triangle is a triangle with one angle that measures 90° (a right angle).

right triangle

An obtuse triangle is a triangle that has an angle that is greater than 90°.

obtuse triangle

 

An acute triangle is a triangle with only acute interior angles (all angles are smaller than 90°.

acute triangle

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