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1 Bigha = 1,369 m2
A foot is a unit of length. A bigha is a unit of area. The two units are therefore incompatible.
1 square foot=0.092 square meters
From the Wikipedia article for "Katha (unit)" (it seems that Cottah is an alternate spelling for Katha): "A Katha is approximately 720-square-foot (67 m2) or 1/20 of a bigha. It is still in use in much of Bangladesh and India"
1 square foot = 0.09290304 square metres.