How can I show that these two lines are perpendicular?

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- January 9th 2009, 06:50 AMSimplicityPerpendicular Vector Lines
How can I show that these two lines are perpendicular?

- January 9th 2009, 07:05 AMSimplicity
I realised that I can show it by direction cosines but is there an alternative method?

- January 9th 2009, 09:10 AMvincisonfire
Usually you would take the dot product. If it is equal to 0 then the line are perpendicular.

- January 9th 2009, 10:14 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?) - January 9th 2009, 10:49 AMSimplicity
- January 9th 2009, 12:07 PMPlato
- January 10th 2009, 03:23 AMSimplicity
- January 10th 2009, 08:36 AMPlato