A square metre is a measure of area in 2-dimensional space while a foot is a measure of length or distance in 1-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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0.3048 m = 1 ft (exactly) ⇒ 0.3048 m x 0.3048 m = 1 ft x 1 ft ⇒ 0.0929 sq m ≈ 1 sq ft ⇒ 30 sq m ≈ 30 ÷ 0.0929 sq ft ≈ 322.92 sq ft
9 sq ft = 1 sq yd so 45 sq ft = 45/9 = 5 sq yds
400 sq ft = 37.161 sq meters (rounded)
Remember A = pi r^2 Hence 3000 = pi r^(2) r^(2) = 3000 / pi ( =3.14) = 954.92965... sq.ft. r = sqrt(954.92965... ) = 30.90193616 ft. Now remember the diamter(d) is twice the radius(r) d = 2r Hence d = 2(30.90191616...) = 61.80387232... ft. d =~= 61.8 ft.
1 sq yd = 1 yd * 1 yd = 3 ft * 3 ft = 9 sq ft. 11 ft * 9 ft = 11*9 sq ft = 99 sq ft = 99/9 sq yd = 11 sq yd