straight angle or line.
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An angle whose measure is exactly 180 degrees is a straight angle.
x*pi / 180 -420*3.14 / 180 = -7.33
every 'obtuse' angle 135 degrees is the angle between 90 and 180. (91, 136, and 179 are a few others.)
54 degrees 180 - 126 = 54
Supplementary angles are angles whose sums =180 degrees. You have a 65 degree angle + it's supplementary angle = 180 degrees. So, to find the supplementary angle, subtract 65 from 180. 180 - 65 = supplementary angle. 115 = supplementary angle. To check, add the angles together. 65 + 115 = 180 (check) (Also, you might be working with complimentary angles. Complimentary angles are angles whose sum = 90 degrees.)