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Question Number 162396 by Mathematification last updated on 29/Dec/21

Commented by Mathematification last updated on 29/Dec/21

$$Thankyousomuch.Buthowdoweknow$$$$whentoapplytheformula?$$

Answered by mr W last updated on 29/Dec/21

$$r_{red}=\frac{1}{\frac{1}{1}+\frac{1}{2}+\frac{1}{3}+2\sqrt{\frac{1}{1\times 2}+\frac{1}{2\times 3}+\frac{1}{3\times 1}}}$$$$r_{red}=\frac{6}{23}$$$$A_{red}=\frac{36\pi }{529}$$

Commented by Tawa11 last updated on 29/Dec/21

$$\mathrm{Great}\mathrm{sir}.$$

Commented by mr W last updated on 29/Dec/21

Commented by mr W last updated on 29/Dec/21

$$r,R=\frac{1}{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\pm 2\sqrt{\frac{1}{ab}+\frac{1}{bc}+\frac{1}{ca}}}$$$$+forr$$$$-forR$$

Commented by mr W last updated on 29/Dec/21

$$seeQ77681formoredetails$$

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