An angle at 181 degrees would be considered a "Reflex" angle. This is because it exceeds 180 degrees which is a "Straight" angle.
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181
181 degree
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.
181
The square root of 181 is: ± 13.453624