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Find the centroid (center of mass) of the annulus with constant density:

$$R_1=\{(x,y): 1\leq x^2+y^2 \leq 4\}$$

A

$(0,0)$

B

$(1,1)$

C

$(2,2)$

D

$(3,3)$

E

$(4,4)$

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