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. 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?

51. Angles What is the unknown angle? 63 + 50 + 75 + 110 = 298, 360 – 298 = 62˚

52. Angles What is the unknown angle?

53. Angles What is the unknown angle? 44 + 101 + 95 + 36 = 276, 360 – 276 = 84˚

54. Angles What is the unknown angle?

55. Angles What is the unknown angle? 79 + 45 + 63 + 70 = 257, 360 – 257 = 103˚

56. Angles What is “x”?

57. Angles What is “x”? x + 2x + 3x + 4x +5x = 15x, 15x =360

58. Angles What is “x”? x + 2x + 3x + 4x +5x = 15x, 15x =360 15x = 360 15 15 x = 24

59. Angles What did the acorn say when he grew up?

60. Angles What did the acorn say when he grew up? Answer: Geometry (Gee, I'm a tree!)

61. Angles Agenda Notes – Homework – Study Guide13-1 Due Friday, Feb 28 Just classify the angle, do not measure with a protractor. Mid-Chapter 13 Quiz Monday, March 3