A geometry problem by Chung Kevin

Geometry Level 1

ABCABC is a right triangle with ACB=90\angle ACB=90^\circ. M M is the midpoint of AB,AB, and DD is a point such that MC=MDMC = MD with points CC and DD lying on opposite sides of AB,AB, as shown in the diagram.

If DAB=40 \angle DAB = 40 ^ \circ, what is DCA \angle DCA ?

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