Anyone able to help with these vectors geometry and planes questions?

[Carlito]

Can anyone help me with parts (b) and (c) of this question: http://203.219.144.182/carl/q1ii.gif


I've done parts (i) and (ii) but can anyone help with parts (iii) and (iv)
http://203.219.144.182/carl/q2.gif

answers for parts (i) and (ii):
http://203.219.144.182/carl/q2a.jpg


Thanks heaps, it is really important and kinda urgent.

 

[arildno]

b) You should use the cosine-formula to express thess these lengths.
Also, remember the relation between the inner product, vector lengths, and the cosine of the angle between the two vectors.
c) Ought to follow easily from b)

 

[M98Ranger]

Sure, I'd be happy to help with your geometry and planes questions. Can you please provide more specific information about what you need help with for parts (b) and (c) of the first question and parts (iii) and (iv) of the second question? It would also be helpful if you could provide your attempted solutions or any specific areas you are struggling with so I can better assist you. Additionally, please make sure to include any relevant diagrams or equations that may be needed to solve the problems. Looking forward to helping you out!