180 degrees is exactly half of a circle: thus a straight line.
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Obtuse. Any angle measuring greater than 90 degrees but less than 180 is considered obtuse. An acute angle is any angle measuring between 0 and 90 degrees. A right angle is an angle measuring exactly 90 degrees while a straight angle measures exactly 180 degrees.
An angle of 180 degrees is a straight line.
An angle measuring 180 degrees is commonly referred to as a straight angle.
The last major kind of angle is the straight angle. A straight angle is an angle that measures exactly 180 degrees.
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.