I would cover the sides of the cake with one long strip of 10" wide fondant and cut a 12" circle for the top of the cake. You could hide the seam with a border decortation where they meet.
What I do when I need to cover a large cake is measure the top and sides to make sure you have a large enough piece of rolled out fondant. I take a large piece of cardboard and cover it with freezer paper. Dust the board well gently lift up the side of the fondant that has been rolled out and slide the board underneath. Position the board over the cake and slide the fondant into place. If I can I try to use my Sweetwise mat but in cases where the cake is to big this is what I do.
But the problem with this cake is that it's 10" tall. I don't see how you can cover a cake that tall using a single piece of fondant without it wrinkling at the bottom. Of course, that could just be because I lack the talent to do it - LOL!
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