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JEE MATHEMATICS MCQ: PROPERTIES OF TRIANGLES

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Application +4 | -1
In a △ABC,r1bc+r2ca+r3ab\triangle A B C, \frac{r_1}{b c}+\frac{r_2}{c a}+\frac{r_3}{a b} is equal to
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Correct option: D
1r−12R\frac{1}{r}-\frac{1}{2 R}
Option D (1r−12R\frac{1}{r}-\frac{1}{2 R}) is correct because it is derived by using the formulas for exradii and the inradius of a triangle.

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