12. The tangent at a point C of a circle and a diameter AB when extended intersect at P. If ∠PCA=110º , find ∠CBA [see Fig. 9.21]. 12. The tangent at a point C of a circle and a diameter AB when extended intersect at P. If ∠PCA=110º find ∠CBA [see Fig. 9.21]. July 5, [...]