If R1 is the circumradius of the pedal t...

If `R_1` is the circumradius of the pedal triangle of a given triangle `A B C ,a n dR_2` is the circumradius of the pedal triangle of the pedal triangle formed, and so on `R_3,R_4` then the value of `sum_(i=1)^ooR_i ,` where `R` (circumradius) of` A B C` is `5` is 8 (b) 10 (c) 12 (d) 15

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