Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Mimi_x3

Amy is 20m S30°W from a tree. Belinda is 50m 110° T from the same tree. Find the distance between them, to the nearest metre.

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    what do S30°W and 110° T mean ?

    • 2 years ago
  2. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Um, I'm not sure but i think South 30 degrees West , 110 degrees true bearing idk. I haven't done it in ages so I forgot xD

    • 2 years ago
  3. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315630919336:dw|

    • 2 years ago
  4. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    like that ^^^ ?

    • 2 years ago
  5. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315631114054:dw|

    • 2 years ago
  6. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Um, idk , it looks right though xDD

    • 2 years ago
  7. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    How can I find the distance between them ?

    • 2 years ago
  8. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315631564224:dw|

    • 2 years ago
  9. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Um, I don't think that it requires sin and cos, its bearings

    • 2 years ago
  10. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315631903573:dw|

    • 2 years ago
  11. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    What? There's not values of x and y, how can you use the distance formula ?

    • 2 years ago
  12. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    I got the values of x and y using the sin() and cos() in the table I drew above. Rounded to the nearest metre, I get 64 meters distance.

    • 2 years ago
  13. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay, tyvm (:

    • 2 years ago
  14. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    does it make sense ? did you learn this stuff in the past ?

    • 2 years ago
  15. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Not in the past xD, I learnt it year 7 and now I forgot xD But I remember that there's an easier way that doesn't require sin and cos

    • 2 years ago
  16. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    Well , if there is an easier way, I hope someone will post it here - coz I'd like to know it too :)

    • 2 years ago
  17. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Hey, you know your diagram what is the angle degrees thing for AB

    • 2 years ago
  18. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    what do you mean ?

    • 2 years ago
  19. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1315632702671:dw|

    • 2 years ago
  20. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    yes we can calculate that - it's 240-110 = 130 degrees

    • 2 years ago
  21. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    and you're right that we can make the problem simpler

    • 2 years ago
  22. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Yep, there's a formula to calculate it then, was it the sine or cosine formula ? or was it soh cah toa ?

    • 2 years ago
  23. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315633004738:dw|

    • 2 years ago
  24. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1315634036159:dw|

    • 2 years ago
  25. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    I would need to calculate to find out - why are you asking ?

    • 2 years ago
  26. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    If that angle can be found, then I can use the sine rule xD

    • 2 years ago
  27. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    are you trying to use the law of the cosines ?

    • 2 years ago
  28. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    No, the Sine Rule it says it in my book xD

    • 2 years ago
  29. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    which sine rule ? a/sin(A)=b/sin(B)=c/sin(C) ?

    • 2 years ago
  30. upsilon
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes, that's it @fiddle

    • 2 years ago
  31. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Yep that xD

    • 2 years ago
  32. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    yes, but we only have one angle , that 130 degrees at this point.

    • 2 years ago
  33. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    I know , but the other angle is 30 right ? the one that I drew

    • 2 years ago
  34. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    why did you pick 30 degrees ?

    • 2 years ago
  35. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    is it becasue sin(30)=1/2 ?

    • 2 years ago
  36. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Well, the question S30°W so that angle is 30 right ?

    • 2 years ago
  37. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315634688115:dw|

    • 2 years ago
  38. upsilon
    Best Response
    You've already chosen the best response.
    Medals 2

    No, you can't say that...@mimi|dw:1315634688202:dw|

    • 2 years ago
  39. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    The 30 degrees would be relative to the black line I drew.

    • 2 years ago
  40. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    yeah, upsilon says the same thing.

    • 2 years ago
  41. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Can it be 60 then, since 90-30 = 60 ?

    • 2 years ago
  42. upsilon
    Best Response
    You've already chosen the best response.
    Medals 2

    You can't decide like that you need the angle to be in ratio with the opposite sides...

    • 2 years ago
  43. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    yep

    • 2 years ago
  44. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    but the law of the cosines might work here.

    • 2 years ago
  45. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    http://hyperphysics.phy-astr.gsu.edu/hbase/lcos.html

    • 2 years ago
  46. upsilon
    Best Response
    You've already chosen the best response.
    Medals 2

    Yea, that will work

    • 2 years ago
  47. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1315635067683:dw|

    • 2 years ago
  48. upsilon
    Best Response
    You've already chosen the best response.
    Medals 2

    \[d = \sqrt{ a^2 + b^2 - 2*a*b*cos\alpha}\]

    • 2 years ago
  49. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Okay, tyvm (:

    • 2 years ago
  50. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    http://www.wolframalpha.com/input/?i=sqrt%2820^2%2B50^2-2*20*50*cos%28130%29%29 It's 64 , same answer I got with the first method :)

    • 2 years ago
  51. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok, ty (:

    • 2 years ago
  52. fiddlearound
    Best Response
    You've already chosen the best response.
    Medals 1

    and it's much shorter than the first method :)

    • 2 years ago
  53. Mimi_x3
    Best Response
    You've already chosen the best response.
    Medals 0

    yup xD. Your method looked so complicated before (:

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.