કોઈપણ $\triangle ABC$ માં, $r_1 r_2 + r_2 r_3 + r_3 r_1$ ની કિંમત શું થાય?

  • A
    $\frac{\Delta^2}{r^2}$
  • B
    $\frac{\Delta}{r}$
  • C
    $\frac{2 \Delta}{r}$
  • D
    $\Delta^2$

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