Porisma
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Vectors: magnitude, direction and products

Use the cross-product direction and laws · Diagrams

Right-hand orientation and reversed cross products

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Schematic plane vectors a,b share an origin; curling from a to b picks the upward unit normal n and cross product a×b. Reversing order picks −n and b×a below the plane. Normals are perpendicular in space; screen angles are schematic. Original hand illustrations are retained in source evidence.
Schematic plane vectors a,b share an origin; curling from a to b picks the upward unit normal n and cross product a×b. Reversing order picks −n and b×a below the plane. Normals are perpendicular in space; screen angles are schematic. Original hand illustrations are retained in source evidence.
Schematic plane vectors a,b share an origin; curling from a to b picks the upward unit normal n and cross product a×b. Reversing order picks −n and b×a below the plane. Normals are perpendicular in space; screen angles are schematic. Original hand illustrations are retained in source evidence.
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