obtuse because its 10 degree more than 90 / a right angle.
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60 degrees
an angle that mesures betweem 180 and 360 degrees is known as a reflex angle.
You do not find are of an angle however an obtuse angle mesures greater than 90 degrees.
I don't know. Why ask me?
Supplementary angle of 100 is (180 - 100) = 80 degrees