1.

In the given figure,\[\angle ABD={{70}^{o}},\angle ADB={{30}^{o}}.\] Then, \[\angle BCD\]is ____.

A. \[{{90}^{o}}\]
B.        \[{{80}^{o}}\]
C.        \[{{100}^{o}}\]
D.        \[{{120}^{o}}\]
Answer» D.        \[{{120}^{o}}\]


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