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Geometry 12 Online
OpenStudy (anonymous):

A plane is an undefined term because it can be named using three noncollinear points is described generally, not using a formal definition is where other geometric shapes can be constructed is a flat surface that extends indefinitely in all directions

Directrix (directrix):

Point, line, and plane are the three undefined terms in classical Euclidean Geometry. There is no formal definition for plane.

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