anonymous one year ago Lisa has to cut her grandma's grass this weekend and wants to know exactly how much area she will be cutting. Calculate the area of the polygon. Be sure to show all your work and explain your answer.

1. anonymous

2. anonymous

3. anonymous

ok so this polygon is an irregular polygon there is no equation to find it

4. anonymous

so first you need to cut the polygon into pieces that can be calculated

5. Loser66

Suggestion: find the biggest one, then subtract the irrelevant parts.

6. anonymous

|dw:1433606810579:dw|

7. Loser66

@MLG360GABEN What is the formula to find area of a rectangular?

8. anonymous

and what formula to find triangles?

9. anonymous

umm A=bh/2 ?

10. Loser66

to find area of a square also. You need them all to solve this problem. Please, state them out

11. anonymous

@MLG360GABEN what is the formula for a square?

12. anonymous

A= a divided by 2 ?

13. anonymous

no the area of a square is A=bh b=base h=height; sound familiar?

14. anonymous

kind of

15. anonymous

im confused

16. anonymous

yes, now look at the pic i drawn above, there is a triangle towards the top left......right?

17. anonymous

yes

18. anonymous

would that be 40?

19. anonymous

no can you write the formula for the triangle and try again?

20. anonymous

A= bh x 2

21. anonymous

@MLG360GABEN you just stated the formula above...... A=(bh)/2

22. anonymous

so 72?

23. anonymous

what does the slash mean?

24. anonymous

divide

25. anonymous

ohh

26. anonymous

18?

27. anonymous

or 36?

28. anonymous

here'$A= \frac{ (20\times20) }{ 2 }$s the formula:

29. anonymous

give me a hint

30. anonymous

well, 20x20 is 400

31. anonymous

is it lower or higher than a 100

32. anonymous

because i got 200

33. anonymous

well you are correct

34. anonymous

so its 200?!

35. anonymous

YEAAAAA

36. anonymous

thank YOU for all your time im sorry if I was frustrating

37. anonymous

no problem

38. anonymous

thanks bye :)

39. anonymous

now you need to find the area of the rectangel to the right

40. anonymous

ok

41. anonymous

so you remember the formula?

42. anonymous

A=bh

43. anonymous

so its A=6x36 right?

44. anonymous

can you find the area?

45. anonymous

i'll try

46. anonymous

its just multiplying :)

47. anonymous

so its just 216

48. anonymous

great!

49. anonymous

is that all did i do it

50. anonymous

now you need to subtract the smaller triangle from 216

51. anonymous

210

52. anonymous

you still need the formula for triangle! A=(bh)/2

53. anonymous

A=(6x6) / 2

54. anonymous

228?

55. anonymous

no the area of the triangle is 18

56. anonymous

yes i got that

57. anonymous

now subtract 216-18

58. anonymous

198

59. anonymous

198

60. anonymous

now add that to the area to the big triangle to the left

61. anonymous

200+198=???

62. anonymous

398

63. anonymous

64. anonymous

yay!!

65. anonymous

:)

66. anonymous

so how should I explain this in my essay?

67. anonymous

hmmm everything we have talked about before, how you split up the polygon into pieces and found the areas. then you added them together and got the final answer. and dont forget to mention the formulas

68. anonymous

ok thanks :)

69. anonymous

bye

70. anonymous

good luck :)