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congruent supplementary 1.2 1.2 Parallel Parallel Lines Lines and and Transversals Transversals Identify interior, exterior, and transversal M L SA ER SV AN TR S EXTERIORQ O INTERIOR N P T R EXTERIOR Vocabulary Transversal: a line that intersects two parallel lines Interior Angles: Formed on the inside of two lines cut by a transversal Exterior Angles: Formed on the outside of two lines cut by a transversal. Vocabulary Alternate interior angles: interior angles on opposite sides of the transversal-not adjacent Alternate exterior angles: exterior angles on opposite sides of the transversal-not adjacent Corresponding Angles: One interior and one exterior angle formed on the same side of the transversal Label alternate interior, alternate exterior, corresponding , vertical, supplementary angles S M Q O N corresponding alternate interior R P T alternate exterior supplementary vertical Explore lines and angles Interior, exterior and alternate angles Interior angles Exterior angles Alternate angles ent. Identify the alternate interior angles uent. Identify the alternate exterior angles Corresponding and vertical angles Identify a corresponding angle to angle 2 Identify a vertical angle to angle 8 2 8 de ry Adjacent angles Identify an adjacent angle to angle 3 Identify an angle which is supplementary to angle 5 3 5 Classify these pairs of angles E B A G C D H EGB & GHD ? C CHF & EGB AE ? EGA & EGB ? A BGH & GHC ? AI GHC & DHF ? V EGA & AGH ? A F AI Alternate interior AE Alternate exterior C A Corresponding Adjacent V Vertical Practice Find the measure of the missing angles. 63o Practice Find the measure of the missing angles. 135o Practice Find the measure of the missing angles. (The interior is a parallelogram!) 102o 102o 78o Practice Find the measure of the missing angles. a c 128o i j f 86o d b e g h k l Practice Find the measure of the missing angles. a b d c 59o f g e i k l p q h j 43o m r n s http://www.ixl.com/math/grade-7/transversal-of-parallel-lines http://www.ixl.com/math/grade-7/find-missing-angles-in-triangles-and-quadrilaterals