Two straight lines and their transversal form four angles externally at their intersection and they are called exterior angles.

A pair of parallel lines and their transversal are intersected. The intersection of them form four exterior angles.

The parallelism of the two straight lines makes the exterior angles which appear alternative opposite side are equal. Thus, two pairs of equal exterior angles are formed geometrically in this case.

A pair of nonparallel lines and their transversal are intersected. The intersection of them also form four exterior angles.

In this case, all four exterior angles are different mainly due to the non-parallelism of the straight lines.

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