coplanar vectors

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• Coplanarity — In geometry, a set of points in space is coplanar if all the points lie in the same geometric plane. For example, three distinct points are always coplanar; but a fourth point or more added in space can exist in another plane, incoplanarly.… …   Wikipedia

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• Lami's theorem — in statics states that: if three coplanar forces are acting on a same point and keep it stationary, then it obeys the relation :frac{A}{sin(gamma)}=frac{B}{sin(eta)}=frac{C}{sin(alpha)}: where A, B and C are the magnitude of forces acting at the …   Wikipedia