It depends on whether the measurements given are inches, feet, miles, or metres, kilometres or some other measure of distance.
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About 13.54 acres.
200 ft * 900 ft = 4.13 acres (to 2 dp).
1 acre is 43560 ft2, so: 200 ft x 7900 ft = 1580000 ft2 = (1580000 / 43560) acres ≈ 36.27 acres
7.413 (rounded)
830 x 77 = 63,910