The formation of an angle between the lines which start from a common point is called angle formed between the lines.

Two straight lines can be started from a common point on the plane and there is an angle formed between them geometrically. This angle is known as an angle formed between the lines which start from a particular point on the plane.

$B$ is a point on the plane and two straight lines are started from this point commonly in two directions. Thus the lines $\overrightarrow{BC}$ and $\overrightarrow{BD}$ are formed geometrically.

There is an angle formed internally between the rays $\overrightarrow{BC}$ and $\overrightarrow{BD}$. The angle $CBD$ is actually formed between lines when the same lines started from a point.

Therefore, the $\angle CBD$ is called an angle formed between the two lines which start from a common point on the plane.

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