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Diagrams of triangles with interior angles and one exterior angle labeled 'x', used to calculate the value of the unknown angle using angle sum properties.

Six geometric diagrams showing triangles with given angles and unknown exterior angles labeled as 'x', illustrating the concept of exterior angles in triangles.

Six geometric diagrams showing triangles with given angles and unknown exterior angles labeled as 'x', illustrating the concept of exterior angles in triangles.

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