An angle of 180 degrees is a straight line.
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An acute angle is lower than 90 degrees. An obtuse angle is higher than 90 degrees. But lower than 180 degrees. A right angle is exactly 90 degrees. A straight angle is exactly 180 degrees. A reflex angle is higher than 180 degrees. A Circle is exactly 360 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".
The last major kind of angle is the straight angle. A straight angle is an angle that measures exactly 180 degrees.
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.
If they're less than 180 degrees, they're obtuse angles. If more than 180 degrees, they're reflex angles. (Exactly 180 degrees is a 'straight' angle.)