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The exterior angle theorem states that an exterior angle of a triangle equals the sum of the two non-adjacent (remote) interior angles, and it forms a linear pair with the interior angle beside it.
Exterior angle theorem
exterior = remote interior 1 + remote interior 2 = 180° − adjacent interior
Yes. Taking one exterior angle at each vertex of any convex polygon, the total is always 360°.
Yes. If the adjacent interior angle is obtuse, its exterior angle is acute and smaller.