Angle is dimensionless.
It's actually the ratio of two lengths ... the length of an arc of the circle to the length
of the radius of the circle.
That ratio is the same number for the same angle in any-size circle, and it's directly
proportional to the angle that cuts the arc.
When you measure angles in radians, the angle IS that number.
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Right angle, obtuse angle, acute angle, supplementary angle, complementary angle, interior angle, exterior angle, adjacent angle
The angle of incidence
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
It is a reflex angle
reflex angle!