^{o} E, (c) due E.

^{o}. If the apparent thickness of the seam as shown by the borehole core is 2m, calculate: (a) the true thickness of the seam and (b) the gradient of the seam.

**Calculate the coordinates of the intersection of two lines given the coordinates of four stations.**

**Calculate the inclined angle φ**

_{n}, referencing measured angles and coordinates of four known points.

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Calculation Examples