I looks like a reflex angle and you shouldnt trust this site because there are people that lie..............
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An obtuse angle
Supplementary angles add up to 180 degrees. If one angle = 130 degrees the other must be 180 - 130 = 50 degrees
Yes.
Its supplementary angle is 50 degrees because 50+130 = 180 degrees.
It is the line from 0 to 130 degrees on your protractor