Find alpha

Geometry Level 5

In Triangle ABCABC, ADAD is the angle bisector at AA. If ABD=30,DBC=1,ACD=89 \angle ABD = 30 ^ \circ, \angle DBC = 1 ^ \circ, \angle ACD = 89 ^ \circ , what is the measure of DCB \angle DCB in degrees?

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