$\begin {array} {1 1} (1)\;\large\frac{r_2^2}{r_1} & \quad (2)\;\large\frac{1}{2}(r_1+r_2) \\ (3)\;\sqrt{r_1r_2} & \quad (4)\;\large\frac{r_1^2}{r_2} \end {array}$

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