"Bjorn Jonsson" <bjj### [at] zzzmmedia is> wrote :
>
> (1) Given two circles, find the four lines that are tangential two both
> circles and the points where they 'touch' the circles.
>
> (2) Given two lines through three points (you can think of this as two
> out of three sides on a triangle), determine the center and radius of a
> circle which 'touches' one of the lines at a point with a known distance
> from the point common to the two lines.
>
When I need to do things like this I open AutoCad and work it out then
use the numbers generated to type it into PovRay. There have been a few
times when I needed to work out the formula, but that usually takes me weeks
of head-banging effort so I am very willing to cheat.
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