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# C4 vector help watch

1. Hi, I'm over some c4 revision notes I've downloaded from physics and maths tutor and came across something I'm slightly confused about.
If "B" is a point on a line, how can B be perpendicular to that line also? I understand AB would be perpendicular but don't see how just the point B is perpendicular to the line.
2. (Original post by AJA1994)
Hi, I'm over some c4 revision notes I've downloaded from physics and maths tutor and came across something I'm slightly confused about.
If "B" is a point on a line, how can B be perpendicular to that line also? I understand AB would be perpendicular but don't see how just the point B is perpendicular to the line.
It is, like you said a point on its own it's not going to be perpendicular to anything.

The question doesn't suggest that the point B is perpendicular to the line though, only that there is a point B such that AB is perpendicular to the line l.
3. (Original post by SeanFM)
It is, like you said a point on its own it's not going to be perpendicular to anything.

The question doesn't suggest that the point B is perpendicular to the line though, only that there is a point B such that AB is perpendicular to the line l.
Sorry my mistake, it says the vector B is perpendicular. The line I'm pointing at is the only part I'm confused at. How do we know OB is perpendicular to that line?

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