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In this video I will explain Postulate 3: The Protractor Postulate – the measure-of-angle(AOB) is equal to the absolute value of the difference of the position of line-segment(OA) on the protractor and the position of line-segment(OB) on the protractor.

Next video in this series can be seen at:
https://youtu.be/JfCmM-NTyqQ