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)=RArea of Delta AHB

Answer»

2R COS A cos B cos C
`R^(2)` cos A cos B cos C
`2R^(2)` cos A cos B cos C
None of the above

Answer :C


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