5 acres = 20,234.2821 square meters
800sq metres is 0.197684 acres.
05 acres = 5 acres = 20234 sq metres.
0.46 acres is 1,861.554 square metres.
200 acres is 809,370 square meters.
That is 3.45 acres- not quite 3 and a half.
4000 square metres is 0.988 acres. Saying that one acre is 4000 square metres is likely to be an adequate approximation, unless you are dealing with tens of thousands of acres.
2000 sq metres = 0.4942 acres
1.5 acres = 6,070.29 square meters
1795 sq metres is 0.44 (0.4435542) acres.
4800 square metres = 1.18610583 acres
2800 sq metres = 0.6919 acres
0.071 acres = 287.327 sq metres