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Vertical Angles and Angle Bisectors 3-3D What are vertical angles? What is an angle bisector? Definition Two angles are vertical angles if and only if their sides form two pairs of opposite rays. OR…When two lines intersect, they form two pairs of vertical angles. 2 1 3 4 Measuring Time You will need your protractor and 2 pieces of linguini. With your partner create vertical angles. Measure all four angles. What do you find? Change your vertical angles and measure all four angles again. What can you conclude? Try it Find the measures of 1, 2, 3. 2 1 3 134° m1 46 m3 46 m2 134 Definition LM is the angle bisector of NLP if and only if M is in the interior of NLP and NLM MLP. N M L P Construction: Angle Bisector Turn to Page 208 and read the 4 steps to construct an angle bisector. Get your compass and a sheet of paper. Let’s try one together. Theorems Vertical angles are congruent. Two perpendicular lines form four right angles. • What are vertical angles? Vertical angles are formed by two intersecting lines. • What is an angle bisector? A ray that cuts an angle in two. Assignment 3-3D Page 209, 1-18, 20-21