An 80 degree angle is an acute angle because it is greater than 0 but less than 90 degrees.
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It is a 4 sided parallelogram
Any angle less than 90 degrees is called actue
The compliment of a 100 degree angle is a 80 degree angle.
An acute angle of 80 degrees can be constructed by means of a protractor and a straight edge
Answer = A 180 degree angle is called a Straight Angle!!