In a circular sheet of metal of radius R, a hole of radius r is made as shown in the given figure. What is the centroid of the remaining shaded area of sheet from A?
1
\(\frac{{R - r}}{{{R^2} - {r^2}}}\)
2
\(\frac{{{R^3} - {r^3}}}{{{R^{}} - r}}\)
3
\(\frac{{{R^3} - {r^3}}}{{{R^2} - {r^2}}}\)
4
\(\frac{{2{R^3} - 2{r^3}}}{{{R^2} - {r^2}}}\)