It is not possible to answer the question without information on the units used for 7 x 20. Are they inches, feet, miles, light years or combinations of these eg 7 inch * 20 light years.
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20*2*7 = 280 square feet
7 * 10 = 70 square feet.
7 feet x 10 feet = 70 square feet
12 x 7 is 84 square feet
There are about 38.48 square feet in a 7' diameter circle