Areas of Parallelograms and Triangles GEOMETRY LESSON 7-1 Pages 351-354 Exercises 1. 240 cm2 2. 20.3 m2 3. 26.79 in.2 4. 20 units2 5. 9 units2 6. 10 units2 7. 6 units2 8. 11.2 9. 0.24 10. 16 11. 14 m2 12. 13.5 yd2 13. 3 ft2 14. a. 1390 ft2 b. Find the entire area of the lot and subtract the area for the flowers. 14. (continued) c. 1550 – 160 = 1390 ft2 15. 15 units2 16. 6 units2 17. 6 units2 18. 12 units2 19. 27 units2 20. 3 units2 8 13 7-1

Areas of Parallelograms and Triangles GEOMETRY LESSON 7-1 21. 21 units2 22. 4 in. 23. 14 cm 24. 18 in.; 12 in. 25. a. b. 24.5 units2 26. a. b. 18 units2 27. a.  b. 16 units2 28. a.  b. 6 units2 29. The area does not change; the height and base AB do not change. 30. 8 units2 31. 9 units2 7-1

Areas of Parallelograms and Triangles GEOMETRY LESSON 7-1 32. 8 units2 33. 4200 yd2 34. Answers may vary. Sample: 35. a. Blank grid; area is 84 units2 while figures are 36 units2. b. No; the figures have the same area. 36. 60 units2 37. 28 units2 38. 4.5 units2 39. 9 units2 40. 6 units2 41. 8.5 units2 42. 20 units2 43. 88 units2 44. 312.5 ft2 45. 525 cm2 46. 12,800 m2 47. 34 in.2 48. 126 m2 49. 19 cm2 7-1

Areas of Parallelograms and Triangles GEOMETRY LESSON 7-1 50. 47 ft2 51. a. 54 in.2 b. 54 in.2 52. B 53. G 54. A 55. F 56. [2] a.It is the distance between y = 2 and y = –3, so 2 – (–3) = 5. b. 25 units2 [1] incorrect explanation OR incorrect answer 57. (a, a) 58. (a + c, b) 59. 108 60. 72 61. 72 62. 36 63. 36 64. 36 65. 7-1

Areas of Parallelograms and Triangles GEOMETRY LESSON 7-1 66. 67. 7-1