1. Unit 10 Review Area Formulas

2. FOR EACH FIGURE: IMAGINE the shape THINK of its AREA FORMULA

3. The “base” of the polygon does not need to be on the bottom!

4. ! The HEIGHT of the polygon does not need to be vertical!

5. The base and height must be PERPENDICULAR to each other!

6. RECTANGLE

7. A = bh

8. The base and height must be perpendicular to each other. h b

9. PARALLELOGRAM

10. A = bh

11. The base and height must be perpendicular to each other. The height can be outside the figure. h b

12. SQUARE

13. A = s 2 A = bh

14. All 4 sides are congruent. A=bh becomes A=s 2 s s

15. TRIANGLE

16. A =

17. The base and height must be perpendicular. base b h

18. TRAPEZOID

19. A =

20. The bases are parallel. b 1 b 2 h

21. RHOMBUS

22. A =

23. Don’t add the diagonals. MULTIPLY the diagonals.

24. KITE

25. A =

26. Don’t add the diagonals. MULTIPLY the diagonals.

27. REGULAR POLYGON

28. A =

29. To find the central angle, divide 360  by the number of sides.

30. A = Apothem = a Perimeter = p a

31. Bonus: Triangle given SAS

32. A =

33. a Cb

34. Circle Area

35. A =

36. The radius is half of the diameter. r

37. CIRCUMFERENCE

38. C = C =

39. C = r

40. Quick Check:

41. Circle Area

42. A =

43. REGULAR POLYGON

44. A =

45. TRAPEZOID

46. A =

47. KITE

48. A =

49. SQUARE

50. A = s 2 A = bh

51. PARALLELOGRAM

52. A = bh

53. CIRCUMFERENCE

54. C = C =

55. RHOMBUS

56. A =

57. TRIANGLE

58. A =

59. RECTANGLE

60. A = bh

63. Triangle