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he region of the angle shaded pink lies outside the two arms of the angle. This region is called the exterior region of the angle. Like the interior region of an angle, the ^{exterior region[also]} extends indefinitely. THERE IS AN ERROR IT IS REGIONAL AND YOU ADDED SO IT MEANS ONLY SO OR REGIONAL ALSO

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Solution

The exterior region of an angle also may extend indefinitely, since the arms containing the angle can extend indefinitely.

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