180 degrees is a straight line. So 181 is one degree more than that. To picture it draw a line segment, place a dot in the center and that is 180 degrees. Not move the left hand ray (line) down just a very very little bit and that is 181 degrees.
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An angle at 181 degrees would be considered a "Reflex" angle. This is because it exceeds 180 degrees which is a "Straight" angle.
181
An angle that is 139 degrees would be considered an "obtuse" angle. This is because it is over 90 degrees and does not exceed 180. Anything below 90 would be considered "acute" while anything above 180 would be considered a "reflex" angle.
The square root of 181 is: ± 13.453624
6.7037