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2.8 Vertical Angles.notebook Bellringer:Solve 2x 3 +4 = 8 September 25, 2015 2.8 Vertical Angles Straight Angle Line A C B Lines are made up of rays that share a common endpoint and extend in opposite directions (Opposite rays). Sep 2511:10 AM Def: If two angles are opposite (across from each other) when two lines intersect, then they are vertical angles. Sep 299:06 AM Theorem: If two angles are vertical angles, then they are congruent. Pairs of Vertical Angles Pairs of Vertical Angles 1 2 4 3 1 2 4 3 5 6 8 7 Are there any vertical angles in the diagram below? 2 8 7 You can assume vertical angles from a diagram!! Sep 299:06 AM 1 6 5 Sep 299:06 AM Find the values of x and y. 3 5 4 NO!!! None of the angles are across from each other and formed by the same two lines. Sep 299:06 AM Sep 299:06 AM 1 2.8 Vertical Angles.notebook September 25, 2015 Homework 2.8 p.102 #1,3,7,12,13,15 Homework Check on Monday 9/28 – 2.5 p.86 #1,2,6,9,14,17 – 2.8 p.102 #1,3,7,12,13,15 Chapter 2 Test next Tuesday 9/29 Summary of things you are allowed to assume from diagram 1. Straight lines and angles 2. Vertical angles Sep 299:06 AM Sep 2511:35 AM 2