ajprincess
Can someone plzzz help me?
Delete
Share
This Question is Closed
ajprincess
Best Response
You've already chosen the best response.
1
alexwee123
Best Response
You've already chosen the best response.
0
ugh vectors :/
alexwee123
Best Response
You've already chosen the best response.
0
well i fail at almost anything related w/ 3d so can't help u here :(
ajprincess
Best Response
You've already chosen the best response.
1
it's k. thanxx anyway.
Roya
Best Response
You've already chosen the best response.
1
dear can u attach graph of this ?
ajprincess
Best Response
You've already chosen the best response.
1
I dnt hav it. I hav only the question. Am sorry. :(
Roya
Best Response
You've already chosen the best response.
1
ok let's try to solve it step by step together .
ajprincess
Best Response
You've already chosen the best response.
1
ha k.:)
Roya
Best Response
You've already chosen the best response.
1
|dw:1337928984058:dw|
ajprincess
Best Response
You've already chosen the best response.
1
I drew this part. Bt where do v place k?
Roya
Best Response
You've already chosen the best response.
1
i just think about it .
Roya
Best Response
You've already chosen the best response.
1
do the alpha beta has special meaning or they are just coefficient ?
ajprincess
Best Response
You've already chosen the best response.
1
they are just coefficients.
Roya
Best Response
You've already chosen the best response.
1
ok we suppose that its in the shape like this
ajprincess
Best Response
You've already chosen the best response.
1
k.
Roya
Best Response
You've already chosen the best response.
1
ajprincess
Best Response
You've already chosen the best response.
1
can u plzz show me the next step if u dnt mind.
Roya
Best Response
You've already chosen the best response.
1
dear i'm thinking .
ajprincess
Best Response
You've already chosen the best response.
1
Ha k.
Roya
Best Response
You've already chosen the best response.
1
dear for writing the plane we need a point and a line which cross the plane am i right ?
ajprincess
Best Response
You've already chosen the best response.
1
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?
Roya
Best Response
You've already chosen the best response.
1
yes so u know out and in multiple .
Roya
Best Response
You've already chosen the best response.
1
if u multiple out and b and like this for others plane u have the line and u have the point .
ajprincess
Best Response
You've already chosen the best response.
1
sorry I didnt get u?
Roya
Best Response
You've already chosen the best response.
1
@Callisto dear i need help here
ajprincess
Best Response
You've already chosen the best response.
1
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.
Roya
Best Response
You've already chosen the best response.
1
i'm not sure i ask a friend for help but what i said is this :
Roya
Best Response
You've already chosen the best response.
1
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
Best Response
You've already chosen the best response.
1
i tried bt nt getting t. can u plzz help me dear?
Roya
Best Response
You've already chosen the best response.
1
u know , i'm not sure about the solution .
ajprincess
Best Response
You've already chosen the best response.
1
oh k. Am sorry.
Roya
Best Response
You've already chosen the best response.
1
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
Best Response
You've already chosen the best response.
1
let me try and see.
Roya
Best Response
You've already chosen the best response.
1
dear is it a special tetrahedron ? i mean symmetric or ortoghonal ?
Roya
Best Response
You've already chosen the best response.
1
if it has any special feature we can use them .
ajprincess
Best Response
You've already chosen the best response.
1
It is nt given. :(
ajprincess
Best Response
You've already chosen the best response.
1
no.
Roya
Best Response
You've already chosen the best response.
1
i'm so sri .
ajprincess
Best Response
You've already chosen the best response.
1
No problem. Bigg thanxxx for trying to help me.
timo86m
Best Response
You've already chosen the best response.
0
Here is how to write the planes of the tetrahedron using vecors I think.
ajprincess
Best Response
You've already chosen the best response.
1
I wrote the equations of planes as follows.
|dw:1337970519951:dw||dw:1337970602748:dw|
ajprincess
Best Response
You've already chosen the best response.
1
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
Best Response
You've already chosen the best response.
1
Am I right @timo86m
timo86m
Best Response
You've already chosen the best response.
0
seems right use it to prove those things it says.
ajprincess
Best Response
You've already chosen the best response.
1
bt that's the place I am stuck.
ajprincess
Best Response
You've already chosen the best response.
1
I got the answer for the first part.:0
timo86m
Best Response
You've already chosen the best response.
0
for 1 you can just take vector D to D1
Use vector addition and it will equal RHS
timo86m
Best Response
You've already chosen the best response.
0
this is a tough one :) lol
ajprincess
Best Response
You've already chosen the best response.
1
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
Best Response
You've already chosen the best response.
1
@timo86m if u dnt mind can u help me to solve the third and fourth part.
timo86m
Best Response
You've already chosen the best response.
0
oh Sorry I dont think i can
ajprincess
Best Response
You've already chosen the best response.
1
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.
timo86m
Best Response
You've already chosen the best response.
0
LOL I did nothing :P It was all you smartypants
ajprincess
Best Response
You've already chosen the best response.
1
:)
timo86m
Best Response
You've already chosen the best response.
0
you did it all :) really
ajprincess
Best Response
You've already chosen the best response.
1
thanxxx for the medal.:)
timo86m
Best Response
You've already chosen the best response.
0
I am proud of you :)
ajprincess
Best Response
You've already chosen the best response.
1
:)
timo86m
Best Response
You've already chosen the best response.
0
Bring on another q :D
Make it easier this time please :P