1.

In the given figure below, AB is a chord of a circle with centre O. A tangent AT is drawn at point A so that \[\angle \mathbf{BAT}\text{ }=\mathbf{4}{{\mathbf{0}}^{{}^\circ }}\]. Then \[\angle \mathbf{ADB}=\]?

A.  \[{{120}^{{}^\circ }}\]   
B.  \[{{130}^{{}^\circ }}\]
C.  \[{{140}^{{}^\circ }}\]
D.  \[{{150}^{{}^\circ }}\]
Answer» D.  \[{{150}^{{}^\circ }}\]


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