What is the measure of this angle?

READ the instructions on the right and INTERACT with the GeoGebra applet below.

Sorry, the GeoGebra Applet could not be started. Please install Java 1.4 (or later) to use this page.

Investigation Steps

  1. The blue point A slides the protractor.
  2. The red point B rotates the protractor.

Check your measurement of angle CAB -

Move blue point C, to create new angles and practice measuring it!

    Create the following angles:
  1. 30°
  2. 120°
  3. 80°

Let the computer generate a new angle to measure.