Question 30Let $BC$ of right triangle $ABC$ be the diameter of a circle intersecting hypotenuse $AB$ in $D.$ At $D$ a tangent is drawn cutting leg $CA$ in $F.$ This information is *not* sufficient to prove that: $DF$ bisects $CA$$DF$ bisects $\angle CDA$$DF=FA$$\angle A=\angle BCD$$\angle CFD=2\angle A$
