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.
The borehole is extended in a straight line and leaves the water-bearing rock layer at a depth of 3600 m below the Earth's surface. The exit point is described in the model as a point $R$ on the line $P Q$. Determine the coordinates of $R$ and calculate the thickness of the water-bearing rock layer rounded to the nearest metre. (for verification: $x _ { 1 }$ and $x _ { 2 }$ coordinate of $R : 1.04$ )
Show by calculation that the second borehole reaches the water-bearing rock layer in the model at the point $T ( t | - t | - 4,3 )$, and explain how the length of the second borehole to the water-bearing rock layer is influenced by the location of the associated drilling site.