Hidden line

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In mathematics, a hidden line is a geometric edge line^[1] that is not visible from an observer's view of a shape or object.

A common practice is to draw the visible edges as solid lines and the hidden lines as dotted lines, dashed lines,^[2] or thinner lines than the visible lines.

Hidden lines can help visualize geometric objects in three-dimensional space. Hidden lines add geometric information about the unseen sides of an object.

A three-dimensional object drawn with solid visible and hidden lines is a wire-frame model of the object.