# arrow_back What is the difference between an initial side and a terminal side of an oriented angle?

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What is the difference between an initial side and a terminal side of an oriented angle?

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As its name suggests, in an oriented angle, the direction of the rotation is important. We imagine the angle being swept out starting from an initial side and ending at a terminal side, as shown below. When the rotation is counter-clockwise from initial side to terminal side, we say that the angle is positive; when the rotation is clockwise, we say the angle is negative.

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