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The disc of mass M with uniform surface ...

The disc of mass M with uniform surface mass density `sigma` is shown in the figure. The centre of mass of the quarter disc (the shaded area) is at the position `(x)/(3) (a)/(pi), (x)/(3) (a)/(pi)` where x is ________. (Round off to the Nearest Integer)
[a is an area as shown in the figure ]

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