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An obtuse angle is an angle that is larger that 90 degrees but smaller than a straight angle (180 degrees). An acute angle is smaller than 90 degrees, a right angle is exactly 90 degrees, and a reflex is larger than 180 degrees but smaller than 360 degrees.
No such thing as opposite of acute angle. An ACUTE angle is an angle of less than 90 degrees. A RIGHT angle is an angle of 90 degrees only. An OBTUSE angle is an angle between 90 degrees and 180 dehrees. An angle of 180 degrees is a straight line. A REFLEX angle is an angle between 180 degrees and 360 degrees.
A reflex angle is 180 degrees or over. An obtuse angle is between 90 and 180 degrees and an acute angle is 90 degrees or less
An angle that measures more than 90 degrees and les than 180 degrees is an obtuse angle.
Greater than 90 degrees and less than 180 degrees