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# Mathematics-Acute Angle

An angle that is less than 90 degree. The corner point of an angle is called vertex and two straight sides are called arms.

**Other Angles**

__Right Angle-__

An angle that is 90 degree exactly.

__Obtuse Angle-__

An angle that is greater than 90 degree but less than 180 degree.

__Reflex Angle-__

An angle that is greater than 180 degree.