vectors question
Hi, I am stuck on how to start part b of this question. Any help will be much appreciated 
(edited 2 years ago)
Original post by mqb2766
What does the zero cross product signify?
I'm not sure but does it mean that r-a and b-a are parallel?
Original post by machau
I'm not sure but does it mean that r-a and b-a are parallel?
Yes, so r must lie on the line ...
Do a sketch in 2D. You can pretty much write down the answer by thinking about whats the same and whats different about the triangle area formula.
(edited 2 years ago)
Original post by mqb2766
Yes, so r must lie on the line ...
Do a sketch in 2D. You can pretty much write down the answer by thinking about whats the same and whats different about the triangle area formula.
Do a sketch in 2D. You can pretty much write down the answer by thinking about whats the same and whats different about the triangle area formula.
thank you. can I assume that C is the midpoint of AB, or is that a silly assumption?
Original post by machau
thank you. can I assume that C is the midpoint of AB, or is that a silly assumption?
I guess to answer the question you need to justify/explain it so that its not an assumption, but you're along the right lines. Remember there are two solutions needed.
Original post by mqb2766
I guess to answer the question you need to justify/explain it so that its not an assumption, but you're along the right lines. Remember there are two solutions needed.
ok this makes sense now, thank you!
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