If two 90 degree angles are placed back-to-back (Figure 5), they total 180 degrees. The sides of this angle form a straight line, so a 180 degree angle is a straight line. Adding two more 90 degree ...

Angles are measured in degrees using a protractor. There are some special angles that are useful to remember… a ¼ turn or right angle = 90° a ½ turn or straight line = 180° ...

If you need a protractor for any of our lessons and activities, please feel free to print it and use this resource. Find the protractor template below: Protractor by WJLA-TV on Scribd.