Parallel lines definition1/2/2023 In order for two lines to be parallel, they must be drawn in the same plane, a perfectly flat surface like a. Next, you’ll use your knowledge of parallel lines to determine the measure of angles. Parallel lines are two lines that are always the same distance apart and never touch. Parallel lines definition how to#Then you’ll learn how to identify transversal lines and angle pair relationships. In the following video, you’ll learn all about classifying lines as parallel, intersecting, or skew. In the video below, you’ll discover that if two lines are parallel and are cut by a transversal, then all pairs of corresponding angles are congruent (i.e., same measure), all pairs of alternate exterior angles are congruent, all pairs of alternate interior angles are congruent, and same side interior angles are supplementary! Same Side Interior Angles (Consecutive Interior Angles) sum to 180 degreesĪnd knowing how to identify these angle pair relationships is crucial for proving two lines are parallel, as Study.Com accurately states.Two alternate exterior angles are congruent. Two alternate interior angles are congruent. That is, two lines are parallel if they’re cut by a transversal such that. You can use the following theorems to prove that lines are parallel. Alternate Interior Angles are congruent Proving that lines are parallel: All these theorems work in reverse.
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