O is the circumcentre of Δ ABC and R1, R2 and R3 are the radii of the – InterviewSolution

1.	O is the circumcentre of Δ ABC and R1, R2 and R3 are the radii of the circum circles of Δles OBC, OCA and OAB, respectively. Let a, b, and c be the sides of Δle ABC. The value of aR−11+bR−12+cR−13 is
Answer» O is the circumcentre of $Δ$ ABC and $R_{1}, R_{2} a n d R_{3}$ are the radii of the circum circles of $Δ^{l e s}$ OBC, OCA and OAB, respectively. Let a, b, and c be the sides of $Δ^{l e}$ ABC. The value of $a R_{1}^{- 1} + b R_{2}^{- 1} + c R_{3}^{- 1}$ is

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