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The plane of a dip circle is set in the ...

The plane of a dip circle is set in the geographic meridian and the apparent dip is `del_(1)`. It is then set in vertical plane perpendicular to the geographic meridian. The appartent dip angle is `delta_(2)`. The declination `theta` at the plane is

A

`tan alpha = sqrt( tan theta_1 tan theta _2) `

B

` alpha = sqrt( tan^2 theta_1 tan^2 theta_2)`

C

` tan alpha = ( tan theta_1)/( tan theta_2)`

D

`tan alpha = ( tan theta_2)/( tan theta_1)`

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