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A obtuse angle is one between 90o and 180o. An reflex angle is one between 180o and 360o.
A reflex angle is between 180˚ and 360˚. (An obtuse angle is between 90˚ and 180˚.)
The angle of inclination.
There is no angle "between" one hand of a clock.
An acute angle is an angle measuring between 0 and 90 degrees.