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ajprincess

Can someone plzzz help me?

  • one year ago
  • one year ago

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  1. ajprincess
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    • one year ago
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  2. alexwee123
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    ugh vectors :/

    • one year ago
  3. alexwee123
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    well i fail at almost anything related w/ 3d so can't help u here :(

    • one year ago
  4. ajprincess
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    it's k. thanxx anyway.

    • one year ago
  5. Roya
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    dear can u attach graph of this ?

    • one year ago
  6. ajprincess
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    I dnt hav it. I hav only the question. Am sorry. :(

    • one year ago
  7. Roya
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    ok let's try to solve it step by step together .

    • one year ago
  8. ajprincess
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    ha k.:)

    • one year ago
  9. Roya
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    |dw:1337928984058:dw|

    • one year ago
  10. ajprincess
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    I drew this part. Bt where do v place k?

    • one year ago
  11. Roya
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    i just think about it .

    • one year ago
  12. Roya
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    do the alpha beta has special meaning or they are just coefficient ?

    • one year ago
  13. ajprincess
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    they are just coefficients.

    • one year ago
  14. Roya
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    ok we suppose that its in the shape like this

    • one year ago
  15. ajprincess
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    k.

    • one year ago
  16. Roya
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    • one year ago
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  17. ajprincess
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    can u plzz show me the next step if u dnt mind.

    • one year ago
  18. Roya
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    dear i'm thinking .

    • one year ago
  19. ajprincess
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    Ha k.

    • one year ago
  20. Roya
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    dear for writing the plane we need a point and a line which cross the plane am i right ?

    • one year ago
  21. ajprincess
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    u mean for writing the eqn of the plane? bt v can write it if v knw the position vectors of thr three points isnt it?

    • one year ago
  22. Roya
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    yes so u know out and in multiple .

    • one year ago
  23. Roya
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    if u multiple out and b and like this for others plane u have the line and u have the point .

    • one year ago
  24. ajprincess
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    sorry I didnt get u?

    • one year ago
  25. Roya
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    take a look at it : http://en.wikipedia.org/wiki/Cross_product

    • one year ago
  26. Roya
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    @Callisto dear i need help here

    • one year ago
  27. ajprincess
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    I hav studied cross product. I dnt get where u apply it here. Am so sorry for disturbing u. Can u plzz explain it a bit more.

    • one year ago
  28. Roya
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    i'm not sure i ask a friend for help but what i said is this :

    • one year ago
  29. Roya
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    in our question we have a b c vectors , for each plane if u cross product both of them u get the line ortoghonal to the plane and u have the point i mean a1 b1 and the other

    • one year ago
  30. ajprincess
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    i tried bt nt getting t. can u plzz help me dear?

    • one year ago
  31. Roya
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    u know , i'm not sure about the solution .

    • one year ago
  32. ajprincess
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    oh k. Am sorry.

    • one year ago
  33. Roya
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    i's so sri because i can't help u . but think about my idea . what if we suppose our space with 3 vector a b c instead i j k ? could we find out the answer ?

    • one year ago
  34. ajprincess
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    let me try and see.

    • one year ago
  35. Roya
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    dear is it a special tetrahedron ? i mean symmetric or ortoghonal ?

    • one year ago
  36. Roya
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    if it has any special feature we can use them .

    • one year ago
  37. ajprincess
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    It is nt given. :(

    • one year ago
  38. Roya
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    i'm not good at english but is it like this ? http://en.wikipedia.org/wiki/File:Tetrahedron_flat.svg

    • one year ago
  39. ajprincess
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    no.

    • one year ago
  40. Roya
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    i'm so sri .

    • one year ago
  41. ajprincess
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    No problem. Bigg thanxxx for trying to help me.

    • one year ago
  42. timo86m
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    Here is how to write the planes of the tetrahedron using vecors I think.

    • one year ago
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  43. ajprincess
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    I wrote the equations of planes as follows. |dw:1337970519951:dw||dw:1337970602748:dw|

    • one year ago
  44. ajprincess
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    I wrote it so cos the equation of a plane through three points is |dw:1337970955268:dw| were r is p.v of any point R on the required plane, a,b and c are p.v of the given points A,B, and C.

    • one year ago
  45. ajprincess
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    Am I right @timo86m

    • one year ago
  46. timo86m
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    seems right use it to prove those things it says.

    • one year ago
  47. ajprincess
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    bt that's the place I am stuck.

    • one year ago
  48. ajprincess
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    I got the answer for the first part.:0

    • one year ago
  49. timo86m
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    for 1 you can just take vector D to D1 Use vector addition and it will equal RHS

    • one year ago
  50. timo86m
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    this is a tough one :) lol

    • one year ago
  51. ajprincess
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    I did it in this way. Let the position vector of D1 with respect to D be d1. Since D1 lies in the plane AB|dw:1337972129746:dw| and since DD1//DK|dw:1337972217587:dw||dw:1337972258266:dw||dw:1337972326958:dw||dw:1337972383792:dw| Such a lengthy method.

    • one year ago
  52. ajprincess
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    @timo86m if u dnt mind can u help me to solve the third and fourth part.

    • one year ago
  53. timo86m
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    oh Sorry I dont think i can

    • one year ago
  54. ajprincess
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    it's k. I got an answer. If I make an adjustment to that I am getting it right. Bt am nt sure if I am right. Anyways thanxxx a lot for coming to the rescue.

    • one year ago
  55. timo86m
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    LOL I did nothing :P It was all you smartypants

    • one year ago
  56. ajprincess
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    :)

    • one year ago
  57. timo86m
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    you did it all :) really

    • one year ago
  58. ajprincess
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    thanxxx for the medal.:)

    • one year ago
  59. timo86m
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    I am proud of you :)

    • one year ago
  60. ajprincess
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    :)

    • one year ago
  61. timo86m
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    Bring on another q :D Make it easier this time please :P

    • one year ago
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