Q.

The angle formed by one side of a triangle and the extension of an adjacent side is called an [[1]] angle.

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answer is EXTERIOR.

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Detailed Solution

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The angle formed by one side of a triangle and the extension of an adjacent side is called an exterior (or external) angle, for example, ∠ACD is the exterior angle of the Δ ABC.

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The angle formed by one side of a triangle and the extension of an adjacent side is called an [[1]] angle.