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How is apparent dip related to true dip? How can true dip be calculated from apparent dip?

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From https://en.wikipedia.org/wiki/Strike_and_dip

Apparent dip is the name of any dip measured in a vertical plane that is not perpendicular to the strike line. True dip can be calculated from apparent dip using trigonometry if you know the strike. Geologic cross sections use apparent dip when they are drawn at some angle not perpendicular to strike.

see http://www.webpages.uidaho.edu/~simkat/geol345_files/2012lab2.html

apparent dip

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