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Measuring Angles

Measuring Angles. When using a protractor, remember: • If you can, start at 0 and count up. • If the angle does not start at 0, use subtraction. • Use ONLY the bottom numbers or the top numbers– don’t mix them up! • Check– is your angle… Acute? Right? Obtuse? Straight?.

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Measuring Angles

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  1. Measuring Angles When using a protractor, remember: • If you can, start at 0 and count up. • If the angle does not start at 0, use subtraction. • Use ONLY the bottom numbers or the top numbers– don’t mix them up! • Check– is your angle… Acute? Right? Obtuse? Straight?

  2. Measuring Angles Hints! Acute: bigger than 0°, less than 90° Right: exactly 90° Obtuse: bigger than 90°, less than 180° Straight: exactly 180°

  3. Measuring Angles Try these on your own. When you’re ready to move on, click the screen to check your work and continue!

  4. 1. Angle measurement: 68° Acute Right Obtuse Straight

  5. 2. Angle measurement: 100° Acute Right Obtuse Straight

  6. 3. Angle measurement: 110° Acute Right Obtuse Straight

  7. 4. Angle measurement: 62° Acute Right Obtuse Straight

  8. 5. Angle measurement: 165° Acute Right Obtuse Straight

  9. 6. Angle measurement: 180° Acute Right Obtuse Straight

  10. 7. Angle measurement: 56° Acute Right Obtuse Straight

  11. 8. Angle measurement: 90° Acute Right Obtuse Straight

  12. 9. Angle measurement: 27° Acute Right Obtuse Straight

  13. 10. Angle measurement: 90° Acute Right Obtuse Straight

  14. 11. Angle measurement: 39° Acute Right Obtuse Straight

  15. 12. Angle measurement: 30° Acute Right Obtuse Straight

  16. 13. Angle measurement: 90° Acute Right Obtuse Straight

  17. 14. Angle measurement: 53° Acute Right Obtuse Straight

  18. 15. Angle measurement: 153° Acute Right Obtuse Straight

  19. 16. Angle measurement: 120° Acute Right Obtuse Straight

  20. 17. Angle measurement: 47° Acute Right Obtuse Straight

  21. 18. Angle measurement: 99° Acute Right Obtuse Straight

  22. 19. Angle measurement: 110° Acute Right Obtuse Straight

  23. 20. Angle measurement: 85° Acute Right Obtuse Straight

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