Measuring Segments and Angles

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Presentation transcript:

Measuring Segments and Angles GEOMETRY LESSON 1-4 9. 25 10. a. 13 b. RS = 40, ST = 24 11. a. 7 b. RS = 60, ST = 36, RT = 96 12. a. 9 b. 9; 18 13. 33 14. 34 1. 9; 9; yes 2. 9; 6; no 3. 11; 13; no 4. 7; 6; no 5. XY = ZW 6. ZX = WY 7. YZ < XW 8. 24 Pages 29–33  Exercises 15. 130 16. XYZ, ZYX, Y 17. MCP, PCM, C or 1 18. ABC, CBA 19. CBD, DBC 1-4

Measuring Segments and Angles GEOMETRY LESSON 1-4 20-23. Drawings may vary. 20. 21. 22. 23. 33. –2.5, 2.5 34. –3.5, 3.5 35. –6, –1, 1, 6 36. a. 78 mi b. Answers may vary. Sample: measuring with a ruler 37–41. Check students’ work. 24. 60; acute 25. 90; right 26. 135; obtuse 27. 34 28. 70 29. Q 30. 6 31. –4 32. 1 1-4

Measuring Segments and Angles GEOMETRY LESSON 1-4 60. 150 61. 30 62. 100 63. 40 64. 80 65. 125 66. 125 49. Answers may vary. Sample: (15, 0), (–9, 0), (3, 12), (3, –12) 50–54. Check students’ work. 55. about 42° 56–58. Answers may vary. Samples are given. 56. 3:00, 9:00 57. 5:00, 7:00 58. 6:00, 12:32 59. 180 42. true; AB = 2, CD = 2 43. false; BD = 9, CD = 2 44. false; AC = 9, BD = 9, AD = 11, and 9 + 9 11 45. true; AC = 9, CD = 2, AD = 11, and 9 + 2 = 11 46. 2, 12 47. 115 48. 65 = / 1-4

Measuring Segments and Angles GEOMETRY LESSON 1-4 71. y = 15; AC = 24, DC = 12 72. ED = 10, DB = 10, EB = 20 73. a. Answers may vary. Sample: The two rays come together at a sharp point. b. Answers may vary. Sample: Molly had an acute pain in her knee. 74. 45, 75, and 165, or 135, 105, and 15 75. 12; m AOC = 82, m AOB = 32, m BOC = 50 76. 8; m AOB = 30, m BOC = 50, m COD = 30 77. 18; m AOB = 28, m BOC = 52, m AOD = 108 78. 7; m AOB = 28, m BOC = 49, m AOD = 111 79. 30 67–68. Answers may vary. Samples are given. 67. QVM and VPN 68. MNP and MVN 69. MQV and PNQ 70. a. 19.5 b. 43; 137 c. Answers may vary. Sample: The sum of the measures should be 180. 1-4

Measuring Segments and Angles GEOMETRY LESSON 1-4 87. never 88. never 89. always 90. never 91. always 92. always 93. always 94. never 95. 25, 30 96. 3125; 15,625 97. 30, 34 80. a–c. Check students’ work. 81. Angle Add. Post. 82. C 83. F 84. D 85. H 86. [2] a. b. An obtuse measures between 90 and 180 degrees; the least and greatest whole number values are 91 and 179 degrees. Part of ABC is 12°. So the least and greatest measures for DBC are 79 and 167. [1] one part correct 1-4