If a side of a triangle is produced, then the exterior angle so formed is equal to the sum of the two interior opposite angles
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If a transversal intersects two parallel lines, then each pair of alternate exterior angles are equal.
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If a transversal intersects two parallel lines, then each pair of alternate interior angles are equal.
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Axiom of corresponding angles: If a transversal intersects two parallel lines, then each pair of corresponding angles are equal.
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