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three different angles involved.
the top is REALLY safe at 20 degrees. 20 degrees is ABOUT 1 inch of drop in 3 inches of run.
The sides are "pretty safe" at 20 degrees, and REALLY safe at 15 degrees. Again, 1 inch of drop in 3 inches of run is pretty safe for the side.
the bottom is best left at 10 degrees. one in 5.
so. assume 96 wide. each side is 48 inches "wide". one in 3 would mean the back would be 144 inches long, which is pretty silly.
if you can make it 60 inches long you will get the vast majority of the benefit, as your top and bottom also taper.
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