it is a straight line
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180 degrees is exactly half of a circle: thus a straight line.
An angle of 180 degrees is a straight line.
Subtract the angel you know from 180 degrees. The answer is its supplement.
Supplementary angles add up to 180 degrees
An acute angle is lower than 90 degrees. An obtuse angle is higher than 90 degrees. But lower than 180 degrees. A right angle is exactly 90 degrees. A straight angle is exactly 180 degrees. A reflex angle is higher than 180 degrees. A Circle is exactly 360 degrees.