Menu Close

Question-49976




Question Number 49976 by ajfour last updated on 12/Dec/18
Commented by ajfour last updated on 13/Dec/18
Thanks Sir, i′ll better this question.
$${Thanks}\:{Sir},\:{i}'{ll}\:{better}\:{this}\:{question}. \\ $$
Commented by ajfour last updated on 12/Dec/18
Find r.
$${Find}\:{r}. \\ $$
Commented by mr W last updated on 12/Dec/18
((R−r)/r)=(r/(2R−r))  2R^2 −3Rr+r^2 =r^2   ⇒r=((2R)/3)
$$\frac{{R}−{r}}{{r}}=\frac{{r}}{\mathrm{2}{R}−{r}} \\ $$$$\mathrm{2}{R}^{\mathrm{2}} −\mathrm{3}{Rr}+{r}^{\mathrm{2}} ={r}^{\mathrm{2}} \\ $$$$\Rightarrow{r}=\frac{\mathrm{2}{R}}{\mathrm{3}} \\ $$

Leave a Reply

Your email address will not be published. Required fields are marked *