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8.1 Planes and the Polyhedron. DEFINITION: Line Parallel to a PlaneA line is parallel to a plane if the line never intersects the plane.. DEFINITION: Perpendicular to a PlaneA line is perpendicular to a plane if the line is perpendicular to all lines in the plane at the point of intersection of
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1. MAT 097 8.1 Planes and the Polyhedron