Τρίτη 1 Μαΐου 2018

A Double Meaning of an Arc's Midpoint

Let $M$ be the midpoint of an arc of the circumcircle of $ΔABC$ apposite vertex $A$, let $I$ denote the incenter of the triangle. Then $M, I$, and $A$ are collinear. In addition, $CM=IM$.

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