1.

R is circumradii of DeltaABC, H is orthocentre, R_(1), R_(2), R_(3) are circumradii of Delta AHB, Delta BHC. If AH produced meet the circumradii of ABC at M and intersect BC at L, angle AHB =180^(@)-C (c )/(sin (180^(@)-C))=2R_(1) (c)/(sin C) =2R_(1) R_(1)=RR_(1)R_(2) +R_(2) R_(3) +R_(1)R_(3) is equal to

Answer»

`2R^(2)`
`3R^(2)`
`5R^(2)`
`R^(2)`

ANSWER :B


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