what is the value of acute angle
You should remember that the value of an acute angle needs to be found in interval `(0^o,90^o)` expressed in degrees or `(0^o,pi/2)` expressed in radians.
Notice that the interval does not include the value of `90^o` , since an angle that measures `90^o` is no more an acute angle, but a right angle.
If the angle is larger than 90^o but smaller than `180^o` , then, the angle is obtuse. Notice that the angle that measures exactly `180^o` is a straight angle.
You also should remember that you may identify different types of triangles, based on angles classification such that:
- acute triangle with all three angles less than `90^o`
- right triangle with an angle of `90^o`
- obtuse triangle with an angle larger than `90^o` but smaller than `180^o` .
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