Question Number 194131 by cortano12 last updated on 28/Jun/23
Commented by BaliramKumar last updated on 28/Jun/23
$$\mathrm{25} \\ $$
Answered by MM42 last updated on 28/Jun/23
$$\left(\mathrm{2}{r}\right)^{\mathrm{2}} −{r}^{\mathrm{2}} =\mathrm{25}\Rightarrow{r}^{\mathrm{2}} =\frac{\mathrm{25}}{\mathrm{3}} \\ $$$${s}=\mathrm{3}{r}^{\mathrm{2}} \Rightarrow{s}=\mathrm{25}\:\checkmark \\ $$$$ \\ $$