If $\theta $1 and $\theta $2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta $ is given by
tan2$\theta $ = tan2$\theta $1 + tan2$\theta $2
cot2$\theta $ = cot2$\theta $1 $-$cot2$\theta $2
tan2$\theta $ = tan2$\theta $1 $-$ tan2$\theta $2
cot2$\theta $ = cot2$\theta $1 + cot2$\theta $2
Solution
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