I don't know how they do that. I know how I would do that. I would reduce the circle (rayon = R) to a regular polygon with a number (n) of sides great enough so that there is no differance between circle and polygon for the driver and the position of the steering wheel. Every side of the polygon makes with the previous side an angle = 360/n. Every side has a length = 2Rsin(180/n)
Willy ============================= Willy Leenders Kloosterlaan 60 B 3500 Hasselt Belgium 50.893722 N 5.34986 E Tel. (00)(#)(0)11 72 04 47 [EMAIL PROTECTED] ============================= The Shaws wrote: > I was driving through the Mersey tunnel the other day (I rarely take the > "Ferry 'cross the Mersey" these days - they will insist on playing that > Gerry and the Pacemakers record on it all the time). > > To reduce the steepness of the incline, the road tunnel curves around quite > a lot. > I noticed that, once you have the steering wheel on the correct "lock", you > don't have to move it again, so the tunnel curve must be the arc of a > circle. > But the centre of the circle must be out there somewhere under all that > rock. > > So, my question is:- How do you draw a circle (or part thereof), when you > can't get to the centre? > > Mike Shaw > > Wirral, UK > 53' 22" N > 03' 02" W
