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Naming acute, obtuse, and right angles

This math skill teaches how to identify and name different types of angles: a right angle measures exactly 90 degrees, an acute angle is less than 90 degrees, an obtuse angle is more than 90 degrees, and a straight angle measures 180 degrees.

Learn naming acute, obtuse, and right angles

Teaching Transcript

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Let's name these types of angles

A perfect corner is 90 degrees, which is called a right angle

An angle smaller than 90 degrees is called an acute angle. Think of small and cute.

An angle larger than 90 degrees is called an obtuse angle.

And an angle that is a straight line, or 180 degrees, is called a straight angle

Skill Practice

Naming acute, obtuse, and right angles

Test your understanding of naming acute, obtuse, and right angles by practicing it! Work through the below exercises to use it in practice.