You should say if the 9 feet is a radius, diameter or circumference.....if radius then 254.47 feet
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1 sq yard = 9 sq feet so 6400 sq yards = 6400*9 = 57600 sq feet.
Assuming the yards means square yards, there are 33 sq yd * 9 sq ft/sq yard = 297 sq feet.
1 gajam = 1 sq yard = 9 sq feet
There are 9 sq feet in a square yard. Doing the math gives an answer of 45 square feet.
9 ft * 7 ft = 63 sq ft = 5.85 sq metres