How can I show that these two lines are perpendicular?

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- Jan 9th 2009, 07:50 AMSimplicityPerpendicular Vector Lines
How can I show that these two lines are perpendicular?

- Jan 9th 2009, 08:05 AMSimplicity
I realised that I can show it by direction cosines but is there an alternative method?

- Jan 9th 2009, 10:10 AMvincisonfire
Usually you would take the dot product. If it is equal to 0 then the line are perpendicular.

- Jan 9th 2009, 11:14 AMHallsofIvy
I agree with vincisonfire. Take the dot products of the direction vectors-the vectors multiplied by .

(Actually, I see a distinct problem with "showing these two lines are perpendicular"- they are not! Are you sure you haven't lost a sign somewhere?) - Jan 9th 2009, 11:49 AMSimplicity
- Jan 9th 2009, 01:07 PMPlato
- Jan 10th 2009, 04:23 AMSimplicity
- Jan 10th 2009, 09:36 AMPlato