question_answer

A tangent ST, touches a circle at B.AB is a chord such that \[\angle \text{ABT}=\text{65}{}^\circ \] Find\[\angle \text{AOB}\], where O is the centre of the circle.

A)  \[\text{12}0{}^\circ \]                  

B)  \[\text{145}{}^\circ \]

C)  \[\text{11}0{}^\circ \]  

D)         \[\text{13}0{}^\circ \]