Learn how to correctly line up and read a protractor to measure different types of angles. For how to use an angle ruler instead of a protractor with which to measure angles, please see the video Measuring Angles with an Angle Ruler. Visit www.realmathsolutions.com for more. "Freddy's Menagerie" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0 http://creativecommons.org/licenses/by/3.0/