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Two equal circles intersect so that thei...

Two equal circles intersect so that their centres, and the points at which they intersect form a square of side 1 cm. The area (in sq.cm) of the portion that is common to the circles is:

A

`(pi)/(4)`

B

`(pi)/(2)-1`

C

`(pi)/(5)`

D

`(sqrt(2)-1)`

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