(In reply to
solution by xdog)
Your solution doesnt match what I found using Geometers Sketchpad, but I found your error.
x + (R2T)/x is a minimum when x = sqrt(R2t), not x+y as you stated.
x + y then simplifies to 2*sqrt(R2t).
An interesting result, which I hadnt noticed is that this means x and y are precisely equal.

Posted by Jer
on 20101014 15:15:37 