In an equilateral triangle the inradius and the circum-radius P are...

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In an equilateral triangle the inradius and the circum-radius
P are connected by

WV
(a) \( \mathrm{r}=4 \mathrm{R} \)
(b) \( \mathrm{r}=\mathrm{R} / 2 \)
(c) \( \mathrm{r}=\mathrm{R} / 3 \)
(d) \( \mathrm{r}=\mathrm{R} / 4 \)
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