Cmu powerpoint presentation

1. 1.4 Measuring Angles by: Keri Adams Focus Question: How do you measure an angle with an angle ruler and a protractor?

2. Investigation 1.4 Materials Angle rulers Protractors Labsheet 1.4 ( Question E Angles)

3. Investigation 1.4 Vocabulary Complimentary angles Supplementary angles

4. Launch: Can you think of an angles that you encounter on a daily basis?

5. Measuring Angles Video Launch: http :// dashweb.pearsoncmg.com / main.htm l

6. Can you estimate these measurements? Prior Knowledge Connection: http:// www.wyzant.com /help/math/geometry/ lines_and_angles / introduction_to_angles

7. Which of these shapes has the smallest angle measure? Which has the angle with the largest measure? Can you find a 90⁰ angle in one of these shapes? How do you know it is 90⁰? How do the angles in Shape D compare to a right angle? Are their measures greater than or less than a right angle? What would be a reasonable estimate of the measure of the greatest angle of Shape D? How do you know? Presenting the Challenge: http:// dashweb.pearsoncmg.com / main.html

8. http:// etc.usf.edu /clipart/42000/42068/protractorf_42068.htm Introduction: What is a protractor and how do you use it? What is an angle ruler and how do you use it? http:// www.schoolmart.com / angleruler.aspx

9. Your turn… Work with your groups to complete Questions A-C. Make sure you sketch each shape and label the angle measures on each shape. Explore:

10. What strategies did your group use to estimate the measures of the angles? Summary: Question A :

11. What were some of your angle measurements? Summary: Question B : http:// dashweb.pearsoncmg.com / main.html

12. Summary: Question C: http:// dashweb.pearsoncmg.com / main.html

13. Summary Question C cont.: Are any of these angles acute, obtuse, or right?

14. Complementary Angles: Pair of angles whose measure add to 90⁰ Supplementary Angles: Pair of angles whose measure add to 180⁰ Pairs of complementary angles: Pairs of supplementary angles: Summary: Question D: http:// dashweb.pearsoncmg.com / main.html

15. Summary: Question E : http:// dashweb.pearsoncmg.com / main.html

16. How do you decide the number of degrees for angles between the 5⁰ intervals on the angle ruler? What things do you check to make sure you are making accurate measurements? Which tool do you prefer for measuring angles? Why? Summary: Question E Cont.:

17. Homework: Page 29 # 19-28 (for #22-24 explain how you got your answer), # 31a & b # 32a & d **You will need a protractor for your homework!!

18. Lesson from, Lappan , Phillips, Fey, Friel . (2014) Connected Mathematics 3 Shapes and Designs. Boston: Pearson. Print.