# 10-20-30-40 What Comes Next

Geometry Level 4

In triangle $$ABC$$, we have a point $$D$$ such that $$\angle DAC = 10^\circ$$, $$\angle DCA = 20^\circ$$, $$\angle DAB = 30^\circ$$ and $$\angle ABC = 40^\circ$$. What is $$\angle BDC$$?

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