The two lines which meet at a point to form an angle are called the sides of the angle.

Two straight lines form an angle by meeting at a point. It seems two straight lines are appeared as the two arms of the human body. Hence, the two straight lines which form an angle by the meeting are known as arms of the angle.

The two straight lines are appeared in two sides but they both connected a point. Hence, the two straight lines which connect each other to form an angle are also known as sides of the angle.

Two straight lines meet at point $E$ and the meeting of both lines formed an angle.

$F$ is any point on the first line and $G$ is any point on the second line. Therefore, the lines are $\overrightarrow{EF}$ and $\overrightarrow{EG}$.

The two lines $\overrightarrow{EF}$ and $\overrightarrow{EG}$ are formed an angle by meeting each other at point $E$.

Hence, the two lines $\overrightarrow{EF}$ and $\overrightarrow{EG}$ are called arms or sides of the angle.

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