90 - 20 = 70 degrees.
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20
20 degrees
Use a protractor and each trisected angle will measure 18 degrees and 20 minutes
consider an angle OAB and let us for simply proof lets say the angle is 40 degree measure the both sides of the angle and then measure the distance measured then multiply it with 20 we will get the product same as the angle
It is: 360/18 = 20 sides