Q68 / 160 · AP EAMCET 2017 (25 Apr Shift 2) · Mathematics

In $\triangle \mathrm{ABC}$, if $r_1=3, r_2=10$ and $r_3=15$, then $\mathrm{R}=$

  • A
    $5$
  • B
    $12$
  • Correct answer
    C
    $\frac{13}{2}$
  • D
    $13$

Hence, the correct answer is option: 'C'.

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