an acre is 1 chain by 10 chains
1 chain = 22 yards or 66 feet
(66ft x 0.3048m/ft)2 x 10 = 4,046.856 square metres
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((1 acre) / 10) * 6 = 2428.11385 sq m
48750 sq m
many sq.m in 6900mm
I'll assume you mean; How much is 450 sq m into square feet?450 sq m ~= 4843.76 sq ft1 m ~= 3.28 ft1 sq m = 1m x 1m~= 3.28ft x 3.28ft~= 10.76 sq ft⇒ 450 sq m ~= 450 x 10.76 sq ft~= 4843.76 sq ft.
360 sq m = 360 x 10.7639 sq ft = 3875 sq ft