Angles and Angle Bisectors

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Presentation transcript:

Angles and Angle Bisectors Lesson 4-2 Angles and Angle Bisectors

Lesson 4-1 Practice Check Your Answers

Page 45 For help on how to measure angles with a protractor you can watch the following video. https://www.youtube.com/watch?v=ABgR-QaMrSU. Stop the video at 2:45.

Page 45 A B C D Part + Part = Whole

Page 46 Draw pictures!!! X Y Z P R T D M Hint: Set up an algebraic expression!! E F G H (75) + (10x) = (20x – 5)

Page 46 Read and highlight the definition for bisector of an angle!! Draw a picture! M A T H These are “congruency markers”

Page 47 Read through Example A. Try to reason through the 2-column proof. A F M L Check your equation: 11x + 4 = 12x - 2 Check your equation: 2(4x – 10) = 6x – 2 --- or --- ½(6x-2) = 4x - 10 Check your equation: (3x + 7) + (6x + 11) = 90

Page 48 Hint: Vertical Angles are __________. Check your equation: (5x + 68) + 9x = 180 Draw a picture!

Page 48 Vertical angles are 

Page 48 Draw a picture!

4-2 Practice