ajprincess
  • ajprincess
Can someone plzzz help me?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
ajprincess
  • ajprincess
1 Attachment
alexwee123
  • alexwee123
ugh vectors :/
alexwee123
  • alexwee123
well i fail at almost anything related w/ 3d so can't help u here :(

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ajprincess
  • ajprincess
it's k. thanxx anyway.
anonymous
  • anonymous
dear can u attach graph of this ?
ajprincess
  • ajprincess
I dnt hav it. I hav only the question. Am sorry. :(
anonymous
  • anonymous
ok let's try to solve it step by step together .
ajprincess
  • ajprincess
ha k.:)
anonymous
  • anonymous
|dw:1337928984058:dw|
ajprincess
  • ajprincess
I drew this part. Bt where do v place k?
anonymous
  • anonymous
i just think about it .
anonymous
  • anonymous
do the alpha beta has special meaning or they are just coefficient ?
ajprincess
  • ajprincess
they are just coefficients.
anonymous
  • anonymous
ok we suppose that its in the shape like this
ajprincess
  • ajprincess
k.
anonymous
  • anonymous
1 Attachment
ajprincess
  • ajprincess
can u plzz show me the next step if u dnt mind.
anonymous
  • anonymous
dear i'm thinking .
ajprincess
  • ajprincess
Ha k.
anonymous
  • anonymous
dear for writing the plane we need a point and a line which cross the plane am i right ?
ajprincess
  • ajprincess
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?
anonymous
  • anonymous
yes so u know out and in multiple .
anonymous
  • anonymous
if u multiple out and b and like this for others plane u have the line and u have the point .
ajprincess
  • ajprincess
sorry I didnt get u?
anonymous
  • anonymous
take a look at it : http://en.wikipedia.org/wiki/Cross_product
anonymous
  • anonymous
@Callisto dear i need help here
ajprincess
  • ajprincess
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.
anonymous
  • anonymous
i'm not sure i ask a friend for help but what i said is this :
anonymous
  • anonymous
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
ajprincess
  • ajprincess
i tried bt nt getting t. can u plzz help me dear?
anonymous
  • anonymous
u know , i'm not sure about the solution .
ajprincess
  • ajprincess
oh k. Am sorry.
anonymous
  • anonymous
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 ?
ajprincess
  • ajprincess
let me try and see.
anonymous
  • anonymous
dear is it a special tetrahedron ? i mean symmetric or ortoghonal ?
anonymous
  • anonymous
if it has any special feature we can use them .
ajprincess
  • ajprincess
It is nt given. :(
anonymous
  • anonymous
i'm not good at english but is it like this ? http://en.wikipedia.org/wiki/File:Tetrahedron_flat.svg
ajprincess
  • ajprincess
no.
anonymous
  • anonymous
i'm so sri .
ajprincess
  • ajprincess
No problem. Bigg thanxxx for trying to help me.
anonymous
  • anonymous
Here is how to write the planes of the tetrahedron using vecors I think.
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ajprincess
  • ajprincess
I wrote the equations of planes as follows. |dw:1337970519951:dw||dw:1337970602748:dw|
ajprincess
  • ajprincess
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.
ajprincess
  • ajprincess
Am I right @timo86m
anonymous
  • anonymous
seems right use it to prove those things it says.
ajprincess
  • ajprincess
bt that's the place I am stuck.
ajprincess
  • ajprincess
I got the answer for the first part.:0
anonymous
  • anonymous
for 1 you can just take vector D to D1 Use vector addition and it will equal RHS
anonymous
  • anonymous
this is a tough one :) lol
ajprincess
  • ajprincess
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.
ajprincess
  • ajprincess
@timo86m if u dnt mind can u help me to solve the third and fourth part.
anonymous
  • anonymous
oh Sorry I dont think i can
ajprincess
  • ajprincess
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.
anonymous
  • anonymous
LOL I did nothing :P It was all you smartypants
ajprincess
  • ajprincess
:)
anonymous
  • anonymous
you did it all :) really
ajprincess
  • ajprincess
thanxxx for the medal.:)
anonymous
  • anonymous
I am proud of you :)
ajprincess
  • ajprincess
:)
anonymous
  • anonymous
Bring on another q :D Make it easier this time please :P

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