Free allows you to draw a tangent line from the curved object you define to the present cusor location.
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Tangent allows you to draw a tangent line between two circles or circular arcs.
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Parallel allows you to draw a line tangent to a curved object and parallel to any line on your drawing.
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Normal allows you to draw a line tangent to a curved object and perpendicular to any line on your drawing.
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Rotation allows you to enter a new angular offset from the base line, replacing the indicated angle when drawing parallel and perpendicular tangent lines.
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Returns you to the original Rotation parameter before you modified it.
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Snap locks the second endpoint to the base line, allowing you to freely move the cursor without changing the tangent line.
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The cancel button aborts the changes you have made inside the dialog box.
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The OK button accepts your changes and closes the dialog.