question_answer

The tangent at a point C of a circle and a diameter AB when extended intersect at P. 0 is the centre of the circle. If \[\angle PCA=110{}^\circ ,\] then find the value of\[\angle CBA\].

A)  \[20{}^\circ \]                         

B)  \[30{}^\circ \]

C)  \[40{}^\circ \]                         

D)  \[70{}^\circ \]

E)  None of these