Quote:
It's just the right triangle formula. a sq. + b sq. = c sq. where c is the long side.
so a = ?
b= 58" (half the diameter of your octagon)
c = 72" (your 6' 2x4's)
a sq = 72 sq. - 58 sq
= 5184 - 3364
= 1820
a = 42.66"
So plus your 40" sides is 82. 66". This does not take into account any over hang outside the edge of the pallets. I would tie the tops together, place the ends at the joints of the pallets, then raise the center like a tent pole to the height you like.
How are your pallets attached together, hinges?
7' really isn't that high in the center if you will be going in there to clean. Remember it will come down to 40" around the perimeter.
I also think putting chicken wire on the out side of the tarp will cause you more problems. It will catch all those pine needles and make it heavy. The smooth surface of the tarp will let stuff slide off.