## Initial Side

### In mathematics, the term “initial side” refers to the starting position of a directed angle or a terminal side

In mathematics, the term “initial side” refers to the starting position of a directed angle or a terminal side.

A directed angle is an angle that is formed by two rays with a specific initial side and a specific terminal side. The initial side represents the ray where the angle begins.

To understand this concept, imagine drawing an angle on a plane. It’s like starting with a reference point and then moving in a specific direction to form the angle. The initial side represents the starting point or the “base” from where the angle is measured.

For example, if you have a directed angle of 45 degrees, the initial side corresponds to the ray where you start measuring the angle. This is typically represented by a small arc symbol at one end of the angle.

It’s important to determine the initial side of a directed angle and the subsequent terminal side because it helps establish the direction and orientation of the angle. Without specifying the initial side, it would be impossible to determine the actual measurement or where the angle is located.

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