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If `H` is the orthocentre of a triangle ABC, then the radii of the circle circumscribing the triangles `B H C ,C H Aa n dA H B` are respectively equal to: a, `R,R,R` b. `sqrt(2)R ,sqrt(2)R ,sqrt(2)R` c. `2R ,2R ,2R` d. `R/2, R/2, R/2`

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