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  4. If h1, h2 and h3 are the lengths of the altitudes of a triangle then (1/h1)+(1/h2)+(1/h3) equals to (Where r is inradius of the incircle of the triangle)

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Q. If $h_1, h_2$ and $h_3$ are the lengths of the altitudes of a triangle then $\frac{1}{h_1}+\frac{1}{h_2}+\frac{1}{h_3}$ equals to
(Where $r$ is inradius of the incircle of the triangle)

Trigonometric Functions

Solution:

Correct answer is (a) $\frac{1}{r}$