# Radians to vector notation

1. Jun 19, 2009

### orthovector

The arc length of a circle is radius times the angle between the two radius legs that connect the arc. Thus
dL = R d@

and dF = I dL x B where B and dL and dF are vectors.

how can I convert dL = R d@ into vector notation so that I can simplify these two expressions??

2. Jun 25, 2009

### priscared

seems an odd question, and further ellaboration is needed.

By the sounds of it, maybe you should just use cylindrical r or spherical co-ordinates.

You should google cylindrical co-odinates. There are standard formulas and fudge factors involved, that will get you to your "vector" co-ordinates.

When you say "Vector" do you mean Cartesian co-ordinates?

If this is in relation to a hw problem, please post the whole question

3. Jun 29, 2009

### viola.geek

(Don't know if you've gotten it since, but...) As far as I'm aware, s = $$\theta$$R, where s is the arc length, $$\theta$$ is the angle, and R is the radius, is entirely scalar. I can only see it "becoming a vector," if that makes sense, if you break literally everything up into components.

Could you please post the whole question?