If you are having issues with viewing the video below, I have also posted it one You Tube.
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or here is the address http://www.youtube.com/watch?v=Lt5-d_6fgww&feature=youtu.be
To measure and angle, place the base line of a protractor along one arm of the angle, with the center of the protractor on the vertex (labeled O) of the angle. Measure from the scale that has its 0 on the arm of the angle.
We can see from this example that the angle is 35o