## eAnthonyR Group Title The diagonals of a square each measure 7 feet. Find the are of the square one year ago one year ago

1. eAnthonyR Group Title

@Loujoelou

2. ajprincess Group Title

|dw:1345312296169:dw| Use pythagoras theorem $$a^2+a^2=7^2$$ $$2a^2=49$$ Area=$$a^2$$ find $$a^2$$ from $$2a^2=49$$

3. eAnthonyR Group Title

So 2a=49 and then divide both sides eright?

4. eAnthonyR Group Title

or just leave thats cool too lol

5. ajprincess Group Title

ya divide by 2 to find a^2

6. satellite73 Group Title

divide the diagonal by $$\sqrt{2}$$ to get the length of the side, then square the result

7. eAnthonyR Group Title

ok gotchu Next question. Two sqaure are similar. The ratio of a set of sides is 2:4. whatis the ratio of their area?

8. satellite73 Group Title

if you call the diagonal $$d$$ then the length of the side is $$\frac{d}{\sqrt{2}}$$ and area is $$\frac{d^2}{2}$$

9. eAnthonyR Group Title

ok gotchu Next question. Two sqaure are similar. The ratio of a set of sides is 2:4. whatis the ratio of their area?

10. Loujoelou Group Title

|dw:1345313796722:dw| This is what the information gives us so far. It splits our square into 2 triangles and we can do pythageoren theorem what the sides are. A^2+B^2=7^2. is the formula for the pythageroen theorem. A^2+B^2=49. We simplified this here. They are both the same thing however because the sides of a square are equal so we really have 2A^2=49. We divide both sides by 2, and get A^2=24.5 Now we have to do the opposite of squaring, and that's square root. Now we have A^2= $\sqrt{24.5}$ This is one side of the square, and we would do $\sqrt{24.5}*\sqrt{24.5}$ to get our area of this square

11. eAnthonyR Group Title

Lol i got the answer xD thanks man :) Next question Two sqaure are similar. The ratio of a set of sides is 2:4. whatis the ratio of their area?

12. Loujoelou Group Title

|dw:1345314609037:dw| with the info. above, that's what we get and for the first square, let's find the area. Area= 2*2; Area=4. So that means for our 1st square we have an area of 4. Now we do the same for the 2nd square, we do Area= 4*4; Area=16. That means the area of both squares is 4 & 16. We put this into a ratio, and we have 4:16, which can be simplified to 1:4 if needed.

13. eAnthonyR Group Title

lol wow haha i wanted to make another question so i could give you another medal haha

14. Loujoelou Group Title

Lol medals don't really matter that much to me. :) I enjoy helping others a lot more :D

15. eAnthonyR Group Title

hah ok so we will stay here <3

16. eAnthonyR Group Title

@Loujoelou

17. Loujoelou Group Title

sure no prob. :)

18. eAnthonyR Group Title

There you goo @Loujoelou

19. eAnthonyR Group Title

20. Loujoelou Group Title

I'm still here. :) Give me a bit of time to solve :D

21. eAnthonyR Group Title

ok :)

22. Loujoelou Group Title

K. so yeah that's the square and you labelled it corretly :). We would do the same thing as we would with regular numbers, and we will multiply (2x+10)(4), and that would give us 8x+40=80. Do you know how to do the rest? :)

23. eAnthonyR Group Title

8x+40=80 -40 -40 8x=40 x=5<3

24. eAnthonyR Group Title

am i right?

25. Loujoelou Group Title

Yep good job!! :)

26. Loujoelou Group Title

and if you wanted to double check this problem, you would put x back into the probolv e. 5 and solve. (2(5)+10)=20, and 20*4=80 so this would be correct :)

27. Loujoelou Group Title

problem as*

28. eAnthonyR Group Title

iight hold on i have to right the next one again <3

29. Loujoelou Group Title

K and hey you got nice handwriting.

30. eAnthonyR Group Title

haha ik all the girls love it <3

31. eAnthonyR Group Title

32. Loujoelou Group Title

K :) All you would do here, is find the area of the bigger rectangle first. 200*140=28000. Now we find the area of the pool. 30*15=450. Finally all we do is subtract them, 28000-450=answer ft.^2

33. eAnthonyR Group Title

Thank you soo Much <3

34. eAnthonyR Group Title

Let me plug in the answers into my hw brb give me a minute

35. Loujoelou Group Title

No prob. :) and okay :)

36. eAnthonyR Group Title

37. Loujoelou Group Title

Yeah :)

38. eAnthonyR Group Title

Thank you :) hold on i have to look for another Hw page

39. Loujoelou Group Title

do you do virtual school o.O?

40. eAnthonyR Group Title

yes hahah

41. eAnthonyR Group Title

Find the area of a rhombus with diagonals of 4ft and 5ft . :) But im done wit virtual school im doing hw now

42. eAnthonyR Group Title

@Loujoelou

43. Loujoelou Group Title

Oh okay I do some virtual school as well :)

44. eAnthonyR Group Title

cools xD

45. eAnthonyR Group Title

Find the area of a rhombus with diagonals of 4ft and 5ft . :)

46. eAnthonyR Group Title

if ur there xD

47. Loujoelou Group Title

K so all we do is D1*D2/2=Area. D1=Diagonal 1 & D2= Diagonal 2

48. Loujoelou Group Title

49. eAnthonyR Group Title

so 4*5 =20/2=10 xD right?

50. Loujoelou Group Title

Yep :)

51. eAnthonyR Group Title

Hahah Yeahhh xD Find the base of the parallelogram that has an area of 228meters squared and has a hheight of 12meters

52. eAnthonyR Group Title

BRB GIVE ME A COUPLE OF mINUTES OK <3

53. Loujoelou Group Title

K :)

54. Loujoelou Group Title

@eAnthonyR

55. eAnthonyR Group Title

YAYYYY xD ahah :p

56. eAnthonyR Group Title

Find the base of the parallelogram that has an area of 228meters squared and has a hheight of 12meters If you dont mind xD

57. Loujoelou Group Title

K so the formula of a parallelogram is Area=Base*Height. From the info above, we got 228=b*12. Can you find the base now? :)

58. eAnthonyR Group Title

Divide right :)?

59. Loujoelou Group Title

Yep. divide 12 on both sides and get b=228/12

60. eAnthonyR Group Title

Find the missing diagonal of the rhombus that has an area of 12 feet sqaures and one diagonal of 6ft. If you may can you explain this one to me so i can understand alittle bit

61. Loujoelou Group Title

K. To find the area of a rhombus we do D1+D2/2=Area. The D1/2 are the diagonals. Using the info. we have we get 6+D2/2=12

62. eAnthonyR Group Title

So do we subtract 12-6? and then thats the D2?

63. Loujoelou Group Title

No, here we multiply the 2 on both sides, so we get 6+D2=24. Then we subtract both sides by 6 and get D2=18 :)

64. Loujoelou Group Title

No, here we multiply the 2 on both sides, so we get 6+D2=24. Then we subtract both sides by 6 and get D2=18 :)

65. eAnthonyR Group Title

Ohhhh we multiply? Ok ok

66. eAnthonyR Group Title

wait but 18 isnt an answer ..

67. Loujoelou Group Title

Wait whoops yeah I made a mistake sry let me see.

68. eAnthonyR Group Title

lol ok <3 its ok xD

69. Loujoelou Group Title

No wait if we double-check what we got, in the formula D1+D2/2=12 and put 6 & 18 in, 18+6/2=12;24/2=12;12=12 it's right.

70. eAnthonyR Group Title

thats weird cause 18 isnt an answer hold on maybe i made a mistake

71. Loujoelou Group Title

What are the choices?

72. eAnthonyR Group Title

4 6 8 2

73. eAnthonyR Group Title

Nope i didnt make a mistake

74. Loujoelou Group Title

I can't seem to find what I did wrong sry. :/ Try posting it as a question, other help you on that one.

75. eAnthonyR Group Title

i posted it xD

76. eAnthonyR Group Title

join it

77. Loujoelou Group Title

Then once we find out what that one is I can help you w/ another one okay?

78. eAnthonyR Group Title

okkk :)