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KutaSoftware Geometry: Exterior Angle Theorem 1/3 - Explanation of how the exterior angle of a triangle equals the sum of the two opposite interior angles.

Diagram illustrating the Exterior Angle Theorem in geometry, showing a triangle with angles labeled a, b, and c, and an exterior angle x, with equations demonstrating that the sum of the two remote interior angles equals the exterior angle.

Diagram illustrating the Exterior Angle Theorem in geometry, showing a triangle with angles labeled a, b, and c, and an exterior angle x, with equations demonstrating that the sum of the two remote interior angles equals the exterior angle.

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