Ed Clarke (in snippedforprivacy@individual.net) said:
 Burt (in snippedforprivacy@4ax.com) said:

 I can't remember the formula for the life of me.
 If a dish is almost 3 ft across and I want to segment it like an
 orange into 10 segments how do I calculate how wide each will be
 at the rim?
 So I end up with a dish that has 10 sides.:)

 I'm math clueless.

 Burt...

 Each of the sides will be 36" * sin(360 degrees / 20) or
 approximately 111/8"

 Too much work and I don't get the same answer anyway. (PI * 36 /
 10) = PI * 3.6 = 11.3097312 etc. etc. etc. Significantly more than
 1/8 inch difference, it's over 11 1/4 inches.
Not too much work if your calculator has trig functions. My Windows
calculator came up with 11.124611797498107267682563018581", which
misses 111/8 by only 0.0004".
Pi * 36 / 10 would be the arc length of the segment, while 36*sin(18)
is the chord length. The difference is
0.18512175542514839078295316122472", somewhere near 3/16"  so the
extra effort may be worthwhile :)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/solar.html