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# C4 vectors help watch

1. show the lines r= 2i + j + µ(-i + 2j + 4k) and r= -i + 3j + 2k + µ(2i - 5j +3k) are perpendicular. I assume you dot the two direction vectors and get 0, but just wanted to check.
2. yep thats wot u do
3. (Original post by Charlie12345)
show the lines r= 2i + j + µ(-i + 2j + 4k) and r= -i + 3j + 2k + µ(2i - 5j +3k) are perpendicular. I assume you dot the two direction vectors and get 0, but just wanted to check.
yup .do the scalar/dot product (thanks pheylan) for the direction vectors
4. thanks - wasn't sure if i was just making that up!
5. (Original post by rbnphlp)
yup .do the cross product for the direction vectors
you've been doing too much mechanics

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Updated: February 11, 2010
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