You may be confused. Perhaps you would like to re-read your earlier
post? I'll highlight it for you:


DSK wrote:
That's why triangular sections have the greatest rigidty for
their cross section area, and square sections are more rigid than
oval or round.

You did say most rigid didn't you? I'd say that rigid means best able to
resist bending -but perhaps you have some other use of the term? It's
strange but engineering texts say that the section that best resists
bending is an I or T section. But Doug is always right so we must all be
wrong!

Now, since you've neatly drawn and posted a diagram why haven't you
actually shown us where your cosine is or what the forces on the boom
are. I gave you a solution but you've not explained why it's wrong.
C'mon share your engineering expertise!

I'd say this is a smokscreen and you are trying to wriggle off the hook.

Cheers