1. Name Lesson #3 - Measuring Angles Gr. 6_

2. EXPLORE  Page 133 – Use a standard protractor.

3. Name Lesson #3 - Measuring Angles Gr. 6_ EXPLORE  Page 133 – Use a standard protractor. You will need a ruler. ➤ Use a ruler to draw an angle. ➤ Have your partner: use the 45°, 90°, and 180° angles above as reference angles to estimate the size of the angle record the estimate ➤ Trade roles. Continue until you have 6 different angles. Try to make angles that are acute, right, and obtuse. ➤ Order the estimates from least to greatest.

4. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles.

5. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles. To measure any angle, just follow these 3 steps:

6. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles. To measure any angle, just follow these 3 steps: 1) Estimate - is it acute ( 90°)?

7. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles. To measure any angle, just follow these 3 steps: 1)Estimate - is it acute ( 90°)? 2) Place protractor properly so the vertex (corner) of the angle is at the center of the protractor and one arm lines up with the base line.

8. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles. To measure any angle, just follow these 3 steps: 1)Estimate - is it acute ( 90°)? 2) Place protractor properly so the vertex (corner) of the angle is at the center of the protractor and one arm lines up with the base line. 3) Start at 0° on the arm along the base line. Slide your finger around the arc of the protractor counting up from 0°. Find where the other arm meets the protractor. Read the measure.

9. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles. What if the angle is a reflex angle?

10. Name Lesson #3 - Measuring Angles Gr. 6_ CONNECT  Page 134-135 Objective – to estimate, measure, and classify angles. What if the angle is a reflex angle? Measure the other side of the angle and subtract from 360º.

11. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7

12. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 1) What is the measure of each angle? Explain how you know. a) b) c)

13. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 1) What is the measure of each angle? Explain how you know. a) 35ºb) c)

14. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 1) What is the measure of each angle? Explain how you know. a) 35ºb) 90ºc)

15. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 1) What is the measure of each angle? Explain how you know. a) 35ºb) 90ºc) 140º

16. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 1) What is the measure of each angle? Explain how you know. a) 35ºb) 90ºc) 140º I know these measures are correct because the protractor was placed on the horizontal arm, and I started on the scale at 0º.

17. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) b) c) d) e) f)

18. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) 30º35º 5º acute b) c) d) e) f)

19. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) 30º35º 5º acute b) 80º76º 4º acute c) d) e) f)

20. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) 30º35º 5º acute b) 80º76º 4º acute c) 110º115º 5º obtuse d) e) f)

21. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) 30º35º 5º acute b) 80º76º 4º acute c) 110º115º 5º obtuse d) 20º21º 1º acute e) f)

22. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) 30º35º 5º acute b) 80º76º 4º acute c) 110º115º 5º obtuse d) 20º21º 1º acute e) 100º107º 7º obtuse f)

23. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 2) EstimateMeasurement Difference Name a) 30º35º 5º acute b) 80º76º 4º acute c) 110º115º 5º obtuse d) 20º21º 1º acute e) 100º107º 7º obtuse f) 170º165º 5º obtuse

24. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 5)

25. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 5) I can tell I’m using the correct scale on the protractor, because ___________________________________________________ ___________________________________________________

26. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 5) I can tell I’m using the correct scale on the protractor, because I start at the 0º mark on the horizontal arm. I can also tell by checking my measurement with my estimate.

27. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 6) Use a protractor to find the measure of each reflex angle. How can you check that your measure is correct? a) b) c)

28. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 6) Use a protractor to find the measure of each reflex angle. How can you check that your measure is correct? I measure the opposite angle and then subtract from 360º. a) b) c)

29. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 6) Use a protractor to find the measure of each reflex angle. How can you check that your measure is correct? I measure the opposite angle and then subtract from 360º. a) 45º So…b) c) 360º - 45º = 315º

30. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 6) Use a protractor to find the measure of each reflex angle. How can you check that your measure is correct? I measure the opposite angle and then subtract from 360º. a) 45º So…b) 110º So… c) 360º - 45º = 315º 360º - 110º = 250º

31. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 6) Use a protractor to find the measure of each reflex angle. How can you check that your measure is correct? I measure the opposite angle and then subtract from 360º. a) 45º So…b) 110º So… c) 165º So… 360º - 45º = 315º 360º - 110º = 250º 360º - 165º = 195º

32. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 7) Use a protractor to solve each riddle. a) I have 4 equal angles. Each angle measures 90°. Which letter am I? b) I do not have any angles that measure 90°. I have 3 angles that measure 60°. I have 2 angles that measure 120°. Which letter am I? c) I have 2 right angles. I have 1 acute angle. I have 1 obtuse angle. Which letter am I? d) Make up your own letter riddle. Trade riddles with a classmate. Solve your classmate’s riddle.

33. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 7) Use a protractor to solve each riddle. a) I have 4 equal angles. Each angle measures 90°. Which letter am I? E or X b) I do not have any angles that measure 90°. I have 3 angles that measure 60°. I have 2 angles that measure 120°. Which letter am I? c) I have 2 right angles. I have 1 acute angle. I have 1 obtuse angle. Which letter am I? d) Make up your own letter riddle. Trade riddles with a classmate. Solve your classmate’s riddle.

34. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 7) Use a protractor to solve each riddle. a) I have 4 equal angles. Each angle measures 90°. Which letter am I? E or X b) I do not have any angles that measure 90°. I have 3 angles that measure 60°. I have 2 angles that measure 120°. Which letter am I? A c) I have 2 right angles. I have 1 acute angle. I have 1 obtuse angle. Which letter am I? d) Make up your own letter riddle. Trade riddles with a classmate. Solve your classmate’s riddle.

35. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 7) Use a protractor to solve each riddle. a) I have 4 equal angles. Each angle measures 90°. Which letter am I? E or X b) I do not have any angles that measure 90°. I have 3 angles that measure 60°. I have 2 angles that measure 120°. Which letter am I? A c) I have 2 right angles. I have 1 acute angle. I have 1 obtuse angle. Which letter am I? K d) Make up your own letter riddle. Trade riddles with a classmate. Solve your classmate’s riddle.

36. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 7) Use a protractor to solve each riddle. a) I have 4 equal angles. Each angle measures 90°. Which letter am I? E or X b) I do not have any angles that measure 90°. I have 3 angles that measure 60°. I have 2 angles that measure 120°. Which letter am I? A c) I have 2 right angles. I have 1 acute angle. I have 1 obtuse angle. Which letter am I? K d) Make up your own letter riddle. Trade riddles with a classmate. Solve your classmate’s riddle. I have exactly 2 right angles. Which letter am I?

37. Name Lesson #3 - Measuring Angles Gr. 6_ PRACTICE  Pages 136 - 138 #’s 1, 2, 5, 6, 7 7) Use a protractor to solve each riddle. a) I have 4 equal angles. Each angle measures 90°. Which letter am I? E or X b) I do not have any angles that measure 90°. I have 3 angles that measure 60°. I have 2 angles that measure 120°. Which letter am I? A c) I have 2 right angles. I have 1 acute angle. I have 1 obtuse angle. Which letter am I? K d) Make up your own letter riddle. Trade riddles with a classmate. Solve your classmate’s riddle. I have exactly 2 right angles. Which letter am I? T