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Angle Measurement Basics: Learn and Practice

Understand angles and their measurements. Learn about right, obtuse, straight, and acute angles. Practice with complementary and supplementary angles. Calculate angle measures in degrees.

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Angle Measurement Basics: Learn and Practice

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  1. 5 Minute Check Solve. Complete in your notebook. 1. 115 + d = 576 2. x - 145 = 537 3. 140c = 35 4. = 23

  2. 5 Minute Check Solve. Complete in your notebook. 1. 115 + d = 576

  3. 5 Minute Check Solve. Complete in your notebook. 1. 115 + d = 576 -115 -115 d = 461

  4. 5 Minute Check Solve. Complete in your notebook. 2. x - 145 = 537

  5. 5 Minute Check Solve. Complete in your notebook. 2. x - 145 = 537 +145 +145 x = 682

  6. 5 Minute Check Solve. Complete in your notebook. 3. 140c = 35

  7. 5 Minute Check Solve. Complete in your notebook. 3. 140c = 35 140 140 c =

  8. 5 Minute Check Solve. Complete in your notebook. 4. = 23

  9. 5 Minute Check Solve. Complete in your notebook. 4. 35 · = 23 · 35 t = 805

  10. Thursday, Feb 27 Chapter13-1 Angles

  11. Angles Objective: To draw and label angles.

  12. Angles Angles are measured in degrees. One degree is 1/360 of a circle. (Or there are 360 degrees in a circle).

  13. Angles Angles have two sides that share a common endpoint called a vertex. vertex

  14. Angles A right angle measures 90°. (Draw angle in notes.) Right angle symbol

  15. Angles A straight angle measures 180°. (Draw angle in notes.)

  16. Angles An obtuse angle measures between 90° and 180°. (Draw angle in notes.)

  17. Angles An acute angle measures between 0°and 90°. (Draw angle in notes.)

  18. Angles An angle of 89° is what type of angle?

  19. Angles An angle of 89° is what type of angle? Since 89° is between 0° and 90°, it is an acute angle.

  20. Angles An angle of 90° is what type of angle?

  21. Angles An angle of 90° is what type of angle? 90° is a right angle.

  22. Angles An angle of 114° is what type of angle?

  23. Angles An angle of 114° is what type of angle? Since 114° is between 90° and 180°, it is an obtuse angle.

  24. Angles Is this angle right, straight, obtuse or acute?

  25. Angles Is this angle right, straight, obtuse or acute? Since the angle is less than 90°, it is acute.

  26. Angles Is this angle right, straight, obtuse or acute?

  27. Angles Is this angle right, straight, obtuse or acute? Since the angle is 180°, it is straight.

  28. Angles Is this angle right, straight, obtuse or acute?

  29. Angles Is this angle right, straight, obtuse or acute? Since the angle has the “right angle symbol”, it must be a right angle.

  30. Angles Two angles are complementary if the sum of their angles is 90°. Two angles are supplementary if the sum of their angles is 180°.

  31. Angles Angles A and B are complementary. If m A = 25°, what is m B?

  32. Angles Angles A and B are complementary. If m A = 25°, what is m B? 90° - 25° = m B 65° = m B

  33. Angles Angles M and N are supplementary. If m M = 85°, what is the measure of N?

  34. Angles Angles M and N are supplementary. If m M = 85°, what is the measure of N? M + N = 180° 85° + N = 180° N = 95°

  35. Angles Angles C and D are complementary. If m C = 47°, what is the measure of D?

  36. Angles Angles C and D are complementary. If m C = 47°, what is the measure of D? C + D = 90° 47° + D = 90° D = 43°

  37. Angles Angles A and B are supplementary. If m A = 127°, what is the measure of B?

  38. Angles Angles A and B are supplementary. If m A = 127°, what is the measure of B? A + B = 180° 127° + B = 180° B = 53°

  39. Angles Angles F and G are supplementary. If m F = 12°, what is the measure of G?

  40. Angles Angles F and G are supplementary. If m F = 12°, what is the measure of G? F + G = 180° 12° + G = 180° G = 168°

  41. Angles If there are 360˚ in a circle and 12 hours on a clock, how many degrees is one hour?

  42. Angles If there are 360˚ in a circle and 12 hours on a clock, how many degrees is one hour? 360˚ ÷ 12 = 30˚

  43. Angles What is the angle formed by the hands of the clock at 2:00?

  44. Angles What is the angle formed by the hands of the clock at 2:00? 60˚ or 300˚

  45. Angles What is the angle formed by the hands of the clock at 9:00?

  46. Angles What is the angle formed by the hands of the clock at 9:00? 90˚or 270 ˚

  47. Angles What is the angle formed by the hands of the clock at 6:00?

  48. Angles What is the angle formed by the hands of the clock at 6:00? 180 ˚

  49. Angles Angles around a point will always add to 360˚.

  50. Angles What is the unknown angle?

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