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Is your run already built? If so, the main factor in your calculations will be where your existing vertical and horizontal supports are, because ideally you will want to fasten the edges of the wire to wood both horizontally and vertically.
And, of course, how many feet of wire you need is directly related to the width of the wire you purchase (you'd need twice as much 24" wide wire than if you purchased 48" wide wire, for example).
If I had to cover the shape you describe, what I would do is use 24" wide wire and run it vertically. This would likely mean that you'd need to add some more vertical supports at 24" on center on the sides for attaching the edges of the wire. You could cut 7 or 8 foot lengths and bend the wire outward at the baseboard to form your apron. If you figure on 8 feet (giving you a generous 3 foot apron), then you'd need to make 10 panels of 24" wide wire at 8 feet in length = 80 feet.
Don't forget that you lose some wire every time you make a cut because you'll want to trim off the sharp protruding wire ends.