Now that you know what angles are, you're ready to start measuring them! The tool we use is called a "protractor", and in this lesson we'll review how to use it, and how to read the numbers on a protractor to measure any angle. You'll get some practice both creating angles, and also measuring some of the many angles you can find in the real world. Ready? Set. Go Measure!

Key takeaways

Measure angles with a protractor

Construct a given angle with a protractor

Standards addressed

CCSS.MATH.CONTENT.4.MD.C.5

Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:

CCSS.MATH.CONTENT.4.MD.C.5.B

An angle that turns through n one-degree angles is said to have an angle measure of n degrees.

CCSS.MATH.CONTENT.4.MD.C.6

Measure angles in whole-number degrees using a protractor. Sketch angles of specified measure.