It is greater than 90 degrees and less than 180 degrees so it is an obtuse angle.
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These two angles total 180o therefore they are each others supplements.
It is acute
An angle greater than 51 degrees is possibly an right angle or can be a obtuse angle.
It is an obtuse angle because it's greater than 90 but less than 180 degrees
Acute, because it is less than 90 degrees.