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First we will study what is clockwise and anti-clockwise
What is clockwise and anti-clockwise?
Clockwise means moving in direction of clock.
Anti-clockwise means moving in opposite direction of clock
Anti-Clockwise angles are positive
In the left, 30° is anti-clockwise.
So, it is positive.
In the right, Here 30° is clockwise.
So, it is –30°
this angle is
360 – 30 = 330°