GDI, my math is rusty

[arirashkae]

Trying to figure out of much pipe I need to run an arc roof over the corral so I can turn it into a chicken run. I know the corral is ~40' wide, and I need it to be about 10' at its peak (maybe more, but if I can nail the original math, I can fudge it #s later), which is ~4 feet  from the top of the posts I'm using to anchor the PVC pipe. My (

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[arirashkae]

I don't think this cold I'm developing is helping any, LOL. And I should probably hold off until the kids are done with the coop, since it'd be kind of embarrassing to get the run all fenced in ... and the coop doesn't fit. XP