At the transition between the two sections of the borehole, the drilling direction must be changed by the angle that is described in the model by the angle of intersection of the two lines $A P$ and $P Q$. Determine the size of this angle.
At the transition between the two sections of the borehole, the drilling direction must be changed by the angle that is described in the model by the angle of intersection of the two lines $A P$ and $P Q$. Determine the size of this angle.