Multiple choice

O is the circumcentre of the triangle ABC and ${ R }{ 1,\quad }{ R }{ 2,\quad }{ R }{ 3 }$ are the radii of the cirucmcircle of the triangles OBC, OCA and OAB respectively, then $\dfrac { a }{ { R }{ 1 } } +\dfrac { b }{ { R }{ 2 } } +\dfrac { c }{ { R }{ 3 } } $ is equal to

  1. $\frac { abc }{ { 4R } } $
  2. $\frac { abc }{ { 4R }^{ 3 } } $
  3. $\frac { abc }{ { 4R }^{ 4 } } $

  4. None
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B Correct answer

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