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Four circles of equal radii are described about the four corners of a square so that each touches two of the other circles. If each side of the square is 140 cm then area of the space enclosed between the circumference of the circle is (taken `pi=22//7` )

A

`"4200 cm"^(2)`

B

`"2100 cm"^(2)`

C

`"7000 cm"^(2)`

D

`"2800 cm"^(2)`

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