An obtuse angle
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The angle with measure more than 0 degrees and less than 90 degrees is an acute angle, the angle with measure 90 degrees is a right angle,the angle with measure more than 90 degrees and less than 180 degrees is an obtuse angle and the angle with measure 180 degrees is a straight angle. Finally, an angle of more than 180 degrees and less than 360 degrees is a reflex angle.
An angle which is more than 180 degrees but less than 360 degrees is called a reflex angle.
An acute angle
Acute Angle - An angle that is less than 90 degrees. Right Angle - An angle that is exactly 90 degrees. Obtuse Angle - An angle that is more than 90 degrees and less than 180 degrees. There is also: Straight Angle - An angle that is exactly 180 degrees. Reflex Angle - An angle that is more than 180 degrees.
An angle less than 90 degrees is an "acute angle". An angle of exactly 90 degrees is a "right angle". An angle more than 90 and less than 180 degrees is an "obtuse angle". An angle of exactly 180 degrees is a "straight angle". An angle of more than 180 degrees is a "reflex angle".