Porisma
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Vectors: planes, normals and distances

Find perpendicular feet and distances · Diagrams

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Construct the perpendicular foot

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Source schematic: P is off the plane; a line r=p+lambda n through P meets it at the perpendicular foot F. Its direction is parallel to normal n. A dashed continuation passes beyond F, and a right-angle marker shows perpendicularity.
Source schematic: P is off the plane; a line r=p+lambda n through P meets it at the perpendicular foot F. Its direction is parallel to normal n. A dashed continuation passes beyond F, and a right-angle marker shows perpendicularity.
Source schematic: P is off the plane; a line r=p+lambda n through P meets it at the perpendicular foot F. Its direction is parallel to normal n. A dashed continuation passes beyond F, and a right-angle marker shows perpendicularity.
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