Both are the same thing, a flat line is equivalent to 180-degrees and vice versa.
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No. An angle of 180o is a straight line.
Draw an L and draw a line coming from the origin of the angle. That dividing line is an angle bisector.
In a right angle triangle, the line across from the riht angle is called the hypotenuse.
acute angle, reflex angle, right angle, a line
Angle bisector