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MathNet 2015-part-06 — 191 problems (EN–VI) Question 106

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

Question 106

Let $ABC$ be a triangle with $AB \gt AC$ and let $M$ be the midpoint of side $AC$. Furthermore, let $D$ be a point on side $AB$ such that $DB = DC$. The parallel to $BC$ through $D$ and the line $BM$ intersect at the point $K$. Show that $\angle KCD = \angle DAC$.