Does anyone know the answer to these two geometry questions? 1. The formula for finding the intersection point of two lines. 2. Given the coordinates of three points that lie on the arc of a circle, how do you find the radius and centre of that circle. I have the source code for the first in C, but of course it is complete gibberish. Even the basic maths formula is complete gibberish, and cannot be written in ASCII... at least by me. Its not really my excuse that I am Australian, lazy and or thick although any or all of these may be true. Also I have no control over Lazlo Toth or what he says. JC ========================================================================== John Clark Aeronaut Automation 30 Kennedy Place Bayview 2104 Australia Phone: 61 2 99 97 28 42 Fax: 61 2 99 79 56 15 email: ArtVandals@... Visit the web site at <http://cygnus.uwa.edu.au/~peterh/> ==========================================================================