1.

If in a triangle, `(1-(r_(1))/(r_(2))) (1 - (r_(1))/(r_(3))) = 2`, then the triangle isA. right angledB. isoscelesC. equilateralD. none of these

Answer» Correct Answer - A
We have `(1-(s-b)/(s-a)) (1-(s-c)/(s-a)) = 2`
or `2(b-a) (c-a) = 4 (s-a)^(2)`
or or `2(bc-ac -ab +a^(2)) = (2s-2a)^(2)`
or `a(bc-ac-ab+a^(2)) = (b+c -a)^(2)`
or `a^(2) = b^(2) + c^(2)`
Hence, triangle is right angled


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