Measuring Angles Using a Protractor

A protractor is a tool used to measure angles in degrees.

The vertex of the angle should be aligned with the center point of the protractor, and the baseline of the protractor should be aligned with one ray of the angle.

A right angle measures 90 degrees.

An acute angle is an angle that measures less than 90 degrees.

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

A straight angle measures exactly 180 degrees.

It is an acute angle.

It is an obtuse angle.

Place the center point of the protractor at the vertex of the angle.

Ensure that the baseline of the protractor is aligned with one ray of the angle.