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ugh vectors :/

well i fail at almost anything related w/ 3d so can't help u here :(

it's k. thanxx anyway.

dear can u attach graph of this ?

I dnt hav it. I hav only the question. Am sorry. :(

ok let's try to solve it step by step together .

ha k.:)

|dw:1337928984058:dw|

I drew this part. Bt where do v place k?

i just think about it .

do the alpha beta has special meaning or they are just coefficient ?

they are just coefficients.

ok we suppose that its in the shape like this

k.

can u plzz show me the next step if u dnt mind.

dear i'm thinking .

Ha k.

dear for writing the plane we need a point and a line which cross the plane am i right ?

yes so u know out and in multiple .

if u multiple out and b and like this for others plane u have the line and u have the point .

sorry I didnt get u?

take a look at it :
http://en.wikipedia.org/wiki/Cross_product

i'm not sure i ask a friend for help but what i said is this :

i tried bt nt getting t. can u plzz help me dear?

u know , i'm not sure about the solution .

oh k. Am sorry.

let me try and see.

dear is it a special tetrahedron ? i mean symmetric or ortoghonal ?

if it has any special feature we can use them .

It is nt given. :(

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

no.

i'm so sri .

No problem. Bigg thanxxx for trying to help me.

Here is how to write the planes of the tetrahedron using vecors I think.

I wrote the equations of planes as follows.
|dw:1337970519951:dw||dw:1337970602748:dw|

Am I right @timo86m

seems right use it to prove those things it says.

bt that's the place I am stuck.

I got the answer for the first part.:0

for 1 you can just take vector D to D1
Use vector addition and it will equal RHS

this is a tough one :) lol

@timo86m if u dnt mind can u help me to solve the third and fourth part.

oh Sorry I dont think i can

LOL I did nothing :P It was all you smartypants

:)

you did it all :) really

thanxxx for the medal.:)

I am proud of you :)

:)

Bring on another q :D
Make it easier this time please :P