You get three angles that are each one third of the original angle.
Note that it is impossible to give a general procedure to trisect any angle by using compasses and straight edge alone. There are special cases which are possible, eg a right angle (90°).
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3. trisect means three
Three ! The answer is in the question !
An equilateral triangle on on of the arms of the right angle.
True
to construct an angle of 20 degrees all you have to do is to trisect an angle of 60degrees