In the figure, all four outer circles are of the same size (radius \( =r \) ), then the radius o... VIDEO
In the figure, all four outer circles are of the same size (radius \( =r \) ), then the radius of the inner circle is
a. \( \mathrm{r} \sqrt{2} \)
b. \( (\sqrt{2}-1) \mathrm{r} \)
c. \( \frac{1}{3 \sqrt{2}} \mathrm{r} \)
d. \( \frac{2}{(\sqrt{2}+1)} \mathrm{r} \)
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