1,200 squared is 1,440,000.
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Divide the number of square inches by 12 squared, that is, by 144.
F = M A = (1200) (5) = 6,000 newtons
Since the units are incompatible, we can't convert in into in². Inches measures length while inches squared measures area.
Assuming it is spherical: area = 4 x pi x radius2. Replace the area, and solve.
There are: pi times 20 squared = 1256.637 square feet rounded to three decimal places