Measuring Angles – Protractor Skills

The skill of learning to measure angles is introduced in the third grade with the concepts and activities of measuring angles becoming more complex as your child gets older.  Being able to properly use a protractor, the ruler used to measure angles, is an important concept to master this skill.

Measuring Angles – Protractor Skills

Learning How to Read Angles & Use Your Protractor

When reading angles, they are in a format that you child may not be familiar with initially.  The symbol ∠ is used to represent an angle, typically followed by a series of letters.  For example, ∠ABC.  This is where the two rays meet at the vertex, and you are measuring the inside portion of how open the space is between the two rays.  If it is smaller than 90˚ it is an acute angle, if it equals 90˚ then it is a right angle, and if it is larger than 90˚ it is an obtuse angle.  This web resource provides both basic and advanced skills and information on measuring angles in an easy to follow format.

To help your child learn how to use a protractor, this video, is a great resource.  It covers the various parts of a protractor, how to use the protractor to measure, and the three main types of angles, right, acute, and obtuse.  Additional information is provided in part two of the video.  You could easily watch this video along with your child, or use it as a review to brush up on your skills when trying to help your child with their homework.

Math Curriculum and Math Games by Smart Tutor

Article by Laura VanHellemont

Photo By tronixstuff



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