> Edley, Steve, Andrew, et al, > > Approximate 'trig.' from memory is all very well, but > why not simple geometry of equality and bisection? >
Because nobody ever pointed it out to me before !! > With a string, twig, or weed-stem part as arbitrary > unit-length b, swing a circular arc. Cut successive > chords of length b, which if connected to the center > form 60° equiangular triangles. Then successively > bisect ... Yep, it's nifty. S.
