With a straight edge and a protractor
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by draw it....:)
draw a base and use this to draw an equilateral triangle each angle of an equilateral triangle adds up to 60 degrees. To have an angle of 120 degree use this angle and then draw another side of a triangle next to it to get a 120 degree angle.
use a protractor
to construct an angle of 20 degrees all you have to do is to trisect an angle of 60degrees
90 - 20 = 70 degrees.