anonymous 3 years ago The diagonals of a square each measure 7 feet. Find the are of the square

1. anonymous

@Loujoelou

2. ajprincess

|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. anonymous

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

4. anonymous

or just leave thats cool too lol

5. ajprincess

ya divide by 2 to find a^2

6. anonymous

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

7. anonymous

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. anonymous

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. anonymous

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. anonymous

|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. anonymous

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. anonymous

|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. anonymous

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

14. anonymous

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

15. anonymous

hah ok so we will stay here <3

16. anonymous

@Loujoelou

17. anonymous

sure no prob. :)

18. anonymous

There you goo @Loujoelou

19. anonymous

20. anonymous

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

21. anonymous

ok :)

22. anonymous

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. anonymous

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

24. anonymous

am i right?

25. anonymous

Yep good job!! :)

26. anonymous

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. anonymous

problem as*

28. anonymous

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

29. anonymous

K and hey you got nice handwriting.

30. anonymous

haha ik all the girls love it <3

31. anonymous

32. anonymous

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. anonymous

Thank you soo Much <3

34. anonymous

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

35. anonymous

No prob. :) and okay :)

36. anonymous

37. anonymous

Yeah :)

38. anonymous

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

39. anonymous

do you do virtual school o.O?

40. anonymous

yes hahah

41. anonymous

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

42. anonymous

@Loujoelou

43. anonymous

Oh okay I do some virtual school as well :)

44. anonymous

cools xD

45. anonymous

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

46. anonymous

if ur there xD

47. anonymous

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

48. anonymous

49. anonymous

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

50. anonymous

Yep :)

51. anonymous

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

52. anonymous

BRB GIVE ME A COUPLE OF mINUTES OK <3

53. anonymous

K :)

54. anonymous

@eAnthonyR

55. anonymous

YAYYYY xD ahah :p

56. anonymous

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. anonymous

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. anonymous

Divide right :)?

59. anonymous

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

60. anonymous

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. anonymous

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. anonymous

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

63. anonymous

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. anonymous

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. anonymous

Ohhhh we multiply? Ok ok

66. anonymous

wait but 18 isnt an answer ..

67. anonymous

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

68. anonymous

lol ok <3 its ok xD

69. anonymous

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. anonymous

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

71. anonymous

What are the choices?

72. anonymous

4 6 8 2

73. anonymous

Nope i didnt make a mistake

74. anonymous

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

75. anonymous

i posted it xD

76. anonymous

join it

77. anonymous

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

78. anonymous

okkk :)