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From: Paul Schrum on 9 Jun 2010 09:48
I am trying to figure out the angle between a line tangent to an
Archimedes Spiral at a given point and the line tangent to the circle
at the same point.

For clarity, let me say it in another way. I want the deflection
angle between a line normal to an Archimedes Spiral at some given
theta and the radial line from the center of the spiral to the point
of interest.

I have searched the web and could not find it. I have tried to derive
it, but my confidence is pretty low.

Can anyone help me either with the equation or with a link to a page
that has it.

Thanks.

- Paul Schrum
Raleigh, NC

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