An angle of 215 degrees is a reflex angle
The reference angle for an angle with the measure of 175 degrees is 5 degrees
Quadrantals are their own reference angle, so 90 degrees.
353 degrees is a reflex angle
It is not. The angle of reference is 2*pi radians or 360 degrees.
Sin(285) is a number, not an angle. The reference angle for 285 degrees is 285-360 = -75 degrees.