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The Cartesian or scaler equation of a plane in R^3 is in the form :
Ax + By + Cz + D =0 with n = (A,B,C)
The normal is:
a non-zero vector perpendicular to all vectors in the plane
To find n :
cross the 2 direction vectors then any scaler multiple
In standard form lead coefficient can’t be:
negative and no fractions at all