Conway,
Can you confirm that the tarp is really 10'x10'. It seems it would be more likely that it is 10'x8'. The tent gazebos that it is made for are 10' wide but not 10' tall so there seems to be no reason to make the sidewall tarp 10' tall. Are there extra tie down loops at the 8' point, or otherwise how would they be fastened to the gazebo?
The website picture shows it as a rectangle--not a square. But, I suppose some of it could be hanging down on the other side.