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It is: 180 -72 = 108 degrees which is its supplement angle
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.
The complementary angle of 72 degrees is 18 degrees
18 degrees