Three points not on same line define a flat surface {plane, mathematics}. Lines and line points are in a plane. Lines perpendicular to all plane lines are perpendicular to plane. At a plane point, only one line can be perpendicular to a plane. At a line point, only one plane can be perpendicular to a line. If normal to a plane is perpendicular to a line, line and plane are parallel.
Mathematical Sciences>Geometry>Solid>Plane
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Date Modified: 2022.0224