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MathNet 2015-part-06 — 191 problems (EN–VI) Question 108

Math Olympiad Vault · MathNet 2015-part-06 — 191 problems (EN–VI)

Question 108

Let $ABC$ be a triangle. The points $K$, $L$ and $M$ lie on the sides $BC$, $CA$ and $AB$ respectively, such that the lines $AK$, $BL$ and $CM$ meet in one point. Show that one can choose two of the triangles $AML$, $BKM$ and $CLK$ such that the sum of their inradii is at least as large as the inradius of triangle $ABC$.