1.

In `DeltaABC, R, r, r_(1), r_(2), r_(3)` denote the circumradius, inradius, the exradii opposite to the vertices A,B, C respectively. Given that `r_(1) :r_(2): r_(3) = 1: 2 : 3` The greatest angle of the triangle is given byA. `cos^(-1) ((1)/(30))`B. `cos^(-1)((1)/(3))`C. `cos^(-1)((1)/(10))`D. `cos^(-1) ((1)/(5))`

Answer» Correct Answer - C
Since c is the greatest side, C is the greatest angle
`cos C = (a^(2) + b^(2) -c^(2))/(2ab) = (25 + 64 - 81)/(2 xx 5 xx 8) = (1)/(10)`


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