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Vertical Angles and Angle Bisectors 3-3D What are vertical angles? What is an angle bisector?

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Presentation on theme: "Vertical Angles and Angle Bisectors 3-3D What are vertical angles? What is an angle bisector?"— Presentation transcript:

1 Vertical Angles and Angle Bisectors 3-3D What are vertical angles? What is an angle bisector?

2 OR…When two lines intersect, they form two pairs of vertical angles. Definition Two angles are vertical angles if and only if their sides form two pairs of opposite rays. 1 2 3 4

3 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?

4 Try it Find the measures of 1 2 3 134°

5 Definition L M N P

6 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.

7 Theorems Vertical angles are congruent. Two perpendicular lines form four right angles.

8 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.

9 Assignment 3-3D Page 209, 1-18, 20-21


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