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a 90 degree angle is a perfect angle of a square so 80 degrees will be 10 degrees less.
86 degrees, like any angle of less than 90 degrees, is an acute angle.
an obtuse angle is greater than 90 degrees and less than 180 degrees
acute means less than 90 degrees like an angle like this < is acute and if an angle is more than 90 degrees its obtuse. :)
An angle greater than 0 but less than 90 degrees is an acute angle as for example the angle in the letter V