olymmath

KöMaL 2025 B5451

    Convex quadrilateral ABCDABCD satisfies properties ∠BAC=2∠CAD\angle BAC=2\angle CAD, ∠ADB=2∠DBA\angle ADB=2\angle DBA, and ∠CBD=30∘\angle CBD=30^{\circ}. What can be the measure of ∠DCA\angle DCA?

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