The answer depends on the units used for 28 and 70. Are they inches, feet, yards, miles, metres? Since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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630 square feet.
70 x 10 = 700 square feet.
840 square feet.
14 feet x 70 feet = 980 square feet.
81.67 square feet.