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The Three Exterior Angles: Visual explanation of how exterior angles of a triangle are formed and calculated.

Diagram illustrating the three exterior angles of a triangle, showing how each exterior angle is formed by extending a side and calculated as a 180° supplement of the adjacent interior angle.

Diagram illustrating the three exterior angles of a triangle, showing how each exterior angle is formed by extending a side and calculated as a 180° supplement of the adjacent interior angle.

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