If you absolutely needed to measure an angle to find out its degree measure, you would use a protractor.
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An angle greater than 51 degrees is possibly an right angle or can be a obtuse angle.
The supplement of an 80 degree angle is an 100 degree angle.
You use the right angle next to an acute angle perhaps and you see that when a angle is closer together it is an acute angle and if it is spread apart or farther apart from a right angle it is an obtuse angle. If the angle is a straight line and doesn't look bent like a right angle it is a straight angle.
54 degrees
70