Two lines are parallel when cut by a transversal, if and only if:
1) Each pair of corresponding angles is congruent. Therefore, their angle
measures must be equal.
2) Each pair of alternate interior angles is congruent. Therefore, their angle
measures must be equal.
3) Each pair of alternate exterior angles is congruent. Therefore, their angle
measures must be equal.
4) Each pair of same-side interior angles is supplementary. Therefore, their
sum their angle measures must be 180°.
5) Each pair of same-side exterior angles is supplementary. Therefore,
their sum their angle measures must be 180°.
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Step-by-step explanation:
Two lines are parallel when cut by a transversal, if and only if:
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