Well, the line that is drawn is just the tangent line of the curve.

by Clippy (Login burger2227)
R

The curve is actually a circle with a varying radius. You can find the TAN like so:

TAN(angle) = Y / X

ATN(Y / X) = angle

This is done in radians to measure the X and Y changes from the start position.

Posted on Nov 23, 2010, 9:29 AM

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