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1 in = 0.0254 m (exactly) 1 sq in = 1 in × 1 in = 0.0254 m × 0.0254 m = 0.00064516 sq m → 76800 sq in = 76800 × 0.00064516 sq m = 49.548288 sq m ≈ 49.55 sq m.
4200 sq ft is approx 390.2 sq m. 1 m ~= 3.28 ft 1 sq m = 1 m x 1 m ~= 3.28 ft x 3.28 ft ~= 10.76 sq ft ⇒ 4200 sq ft ~= 4200 ÷ 10.74 sq m ~= 390.19 sq m
1 yd = 0.9144 m (exactly) 1 sq yd = 1 yd × 1 yd = 0.9144 m × 0.9144 m ≈ 0.8361 sq m → 240 sq yd ≈ 240 × 0.8361 sq m ≈ 200.67 sq m.
1 sq metre = 1550.0031 sq inches
0.3048 m = 1 ft (exactly) ⇒ 33 sq m = 33 x 1 sq m = 33 x (1 m x 1 m) = 33 x ((1 ÷ 0.3048) ft x (1 ÷ 0.3048) ft) ≈ 355.21 sq ft