My book says,

''consider a ray OA. If this ray revolves about its end point O in an anti-clockwise direction and takes position OB, then we say the

angle ∠AOB has been generated as a positive angle and a negative angle. or simply say that angle is a measure or an amount of revolution of a given ray about its initial point.

The angle is positive or negative if the initial line revolves in anti-clockwise or clockwise direction to get the terminal line''

Still, I cannot understand the concept. Could you get the point easier for me, please?

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