angles are formed by adjacent sides of the polygon at the vertices, whereas angles are formed by the sides of the polygon when an adjacent side is extended.

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Solution

Angles formed by adjacent sides of the polygon at the vertices are called interior angles.

Examples of interior angles: $∠ C B A, ∠ B A E$

Angles formed by the sides of the polygon when an adjacent side is extended are called exterior angles.

Here, $∠ B^{/} B C$ is an exterior angle.

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