©B W2R0 f1K21 fK Su gtpa y 1S zo QfRtlw ja jr Ee4 lLyLSC2.c x QAPl 7ly Trpifg uh Tt3ss zr QeTsLe4r Xvle 6dq. c S PMZaAd Xe4 ywKiJt 5h o oI 7nWf0i ynri wtceO WP1r YeD-DA 4l Vg4e8bhr Zad. If two lines are perpendicular, then they intersect to form four right angles. Theorem 3.10 If two sides of two adjacent acute angles are perpendicular, then the angles are complementary. Theorem 3.11 Perpendicular Transversal Theorem If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other. Theorem 3.12 Sep 5, 2015 - Worksheet of proofs for parallel lines cut by a transversal. Students will practice using theorems about parallel lines, including Alternate Interior Angles Theorem, Alternate Exterior Angles Theorem, Corresponding Angles Postulate, Consecutive Interior Angles Theorem, as well as Linear Pair Postul... Start studying Geometry Chapter 3 Parallel and Perpendicular Lines Vocabulary. Learn vocabulary, terms, and more with flashcards, games, and other study tools.