An angle that measures 87.177 degrees would be considered an acute angle. This is because its degrees measurement is below 90 degrees.
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acute angle obtuse angle right angle reflex angle a straight 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.
Complementary angle to which angle?
A reflex angle
An angle greater than 51 degrees is possibly an right angle or can be a obtuse angle.