Because of the formula: (n-2)*180 = total sum of interior angles where n is the number of sides of the polygon.
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Should be 270 degrees. Supplementary angles add up to 180 Complimentary add up to 90. 180 + 90 = 270
All angles between 180 and 360 degrees are reflex angles.
90 degrees 180 degrees 270 degrees 360 degrees!
In this Universe EVERY triangle on a flat surface has angles that total 180 degrees. On a sphere the total can be 270 degrees, but I don't think you should bother your pretty little head with that.
180/270 = 2/3 or 0.66...