In another thread, Stormcrow posted this picture showing his setup of a 10 x 8 tarp (the green one).

I like big tarps, but I am thinking about a 10 x 7.

First question: I assume the ridgeline in the photo is 8', not 10', correct?
Second question: Is 7' ridgeline to short? (I have 120" DIY gathered end)
Third quesiton: If 7' is too short, does anyone set up with a 10' ridgeline? That would mean pretty short sides. Will 7' give enuf side coverage?