It's a flat line.
Or a line segment.
Or a "half line" with one endpoint (the vertex of the 0 degree angle).
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An acute angle.
An angle of 23 degrees is an acute angle because it is greater than 0 but less than 90 degrees.
80 degrees is an acute angle because it is greater than 0 but less than 90 degrees
It is an acute angle that is greater than 0 but less than 90 degrees
an acute angle. an obtuse angle is 91-179, then a straight angle is 180. a reflex angle is 181- 360.