vikpro - thanks for sharing your calculations with me, but the geometry you are considering is different from mine.

lalbratros - Please contact me @ bodero_l@hotmail.com to provide you with a drawing.

 thanks,

Dear Fac09,

Please send me your calculation @  my email    vikprocem@gmail.com.

Vikpro

fac09,

Please upload your picture somewhere on the web.
You will then be able to show it here and to comment it as I illustrate here below.
I think this is better than starting a discussion here and finishing it in an email.
If all threads here would be turned in email exchange, then for sure I will not read this forum anymore.

The problem you are suggesting might have a compact analytical solution or it might need a more numerical approach. In any case it will be resolved by a bit of geometry.

Michel

inserting a pricture here:

Michel, I agree with you on contributing to the forum instead of sharing information over e-mail. I have not been succesul as far as inserting a picture i here. I am being asked for an "image URL" which I don't have.