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In triangle A B C ,l e tR=c i r c u m r...

In triangle ` A B C ,l e tR=c i r c u m r a d i u s ,r= i n r a d i u sdot` If `r` is the distance between the circumcenter and the incenter, the ratio `R/r` is equal to (a)`sqrt(2)-1` (b) `sqrt(3)-1` (c)`sqrt(2)+1` (d) `sqrt(3)+1`

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