21ftx13ft in meter square

21ft * 13ft = X             

1ft = 0.3048m

X = (21*0.3048) * (13*0.3048)

X = 6.4008 * 3.9624

X = 25.36m²

or

21ft * 13ft = 273ft²

273ft² /1 * 1m² /10.76ft² = 273m² /10.76 = 25.36m²

or

21ft * 13ft = 273ft²

273ft² /1 *(100m/328ft)*(100m/328ft) = 2730000m² / 107639 = 25.36m²