an angle measuring from 0 - 89.999 degrees is an acute angle.
an angle at exactly 90 degrees is a right angle.
an angle from 90.001 degrees to 180 degrees is an obtuse angle.
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an acute angle
The fourth exterior angle is 93 degrees so the fourth interior angle must be 87 degrees because there are 180 degrees on a straight line.
It is an acute angle
It is an acute angle. All angles from 1 - 89 degrees are acute. A 90 degree angle is a right angle. Angles from 91 - 179 are obtuse angles.
An obtuse angle is a measurement of 91 degrees to 179 degrees. If it is 90 degrees, it is a right angle. If it is 1 degree to 89 degrees it is an acute. If it is 180 degrees it is a straight angle.