1990 OIM Problems/Problem 2

Problem

In a triangle $ABC$, let $I$ be the center of the inscribed circle and $D$, $E$ and $F$ be its points of tangency with the sides $BC$, $AC$ and $AB$, respectively. Let $P$ be the other point of intersection of the line $AD$ with the inscribed circle.

If $M$ is the midpoint of $EF$, show that the four points $P$, $I$, $M$ and $D$ belong to the same circle.

~translated into English by Tomas Diaz. ~orders@tomasdiaz.com

Solution

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See also

https://www.oma.org.ar/enunciados/ibe5.htm