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ajprincess

  • 2 years ago

Can someone plzzz help me?

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  1. ajprincess
    • 2 years ago
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  2. alexwee123
    • 2 years ago
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    ugh vectors :/

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

  4. ajprincess
    • 2 years ago
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    it's k. thanxx anyway.

  5. Roya
    • 2 years ago
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    dear can u attach graph of this ?

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

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

  8. ajprincess
    • 2 years ago
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    ha k.:)

  9. Roya
    • 2 years ago
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    |dw:1337928984058:dw|

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

  11. Roya
    • 2 years ago
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    i just think about it .

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

  13. ajprincess
    • 2 years ago
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    they are just coefficients.

  14. Roya
    • 2 years ago
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    ok we suppose that its in the shape like this

  15. ajprincess
    • 2 years ago
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    k.

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

  18. Roya
    • 2 years ago
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    dear i'm thinking .

  19. ajprincess
    • 2 years ago
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    Ha k.

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

  21. ajprincess
    • 2 years ago
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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?

  22. Roya
    • 2 years ago
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    yes so u know out and in multiple .

  23. Roya
    • 2 years ago
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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 .

  24. ajprincess
    • 2 years ago
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    sorry I didnt get u?

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

  26. Roya
    • 2 years ago
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    @Callisto dear i need help here

  27. ajprincess
    • 2 years ago
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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.

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

  29. Roya
    • 2 years ago
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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

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

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

  32. ajprincess
    • 2 years ago
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    oh k. Am sorry.

  33. Roya
    • 2 years ago
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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 ?

  34. ajprincess
    • 2 years ago
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    let me try and see.

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

  36. Roya
    • 2 years ago
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    if it has any special feature we can use them .

  37. ajprincess
    • 2 years ago
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    It is nt given. :(

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

  39. ajprincess
    • 2 years ago
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    no.

  40. Roya
    • 2 years ago
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    i'm so sri .

  41. ajprincess
    • 2 years ago
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    No problem. Bigg thanxxx for trying to help me.

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

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

  44. ajprincess
    • 2 years ago
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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.

  45. ajprincess
    • 2 years ago
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    Am I right @timo86m

  46. timo86m
    • 2 years ago
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    seems right use it to prove those things it says.

  47. ajprincess
    • 2 years ago
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    bt that's the place I am stuck.

  48. ajprincess
    • 2 years ago
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    I got the answer for the first part.:0

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

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

  51. ajprincess
    • 2 years ago
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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.

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

  53. timo86m
    • 2 years ago
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    oh Sorry I dont think i can

  54. ajprincess
    • 2 years ago
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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.

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

  56. ajprincess
    • 2 years ago
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    :)

  57. timo86m
    • 2 years ago
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    you did it all :) really

  58. ajprincess
    • 2 years ago
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    thanxxx for the medal.:)

  59. timo86m
    • 2 years ago
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    I am proud of you :)

  60. ajprincess
    • 2 years ago
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    :)

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

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