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55 degrees.
to construct an angle of 20 degrees all you have to do is to trisect an angle of 60degrees
A reflex angle is an angle greater than 180 degrees and less than 360 degrees. To construct one draw two lines at an angle and draw the angle measurement circle around the side you normally don't do it on.
draw 2 angles that add up to 180 degrees
obtuse* angles are between 180 degrees and 90 degrees. Straight line and right angle.