1.

AL, BM and CN are perpendicular from angular points of a triangle ABC on the opposite sides BC, CA and AB respectively. Delta is the area of triangle ABC, (r ) and R are the inradius and circumradius. If radis of the incircle of Delta LMN is r', then the valur of r' sec A sec B sec C is

Answer»

4R
3R
2R
R

Answer :A


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