##ax +by +cz +d = 0## is the equation of a plane orthogonal to ##(a,b,c)## but why is there a d in the equation? What does it do to the plane geometrically?(adsbygoogle = window.adsbygoogle || []).push({});

http://i.imgur.com/sMiLhHc.jpg?1

I don't see how the d fits into that geometric interpretation.

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# Point Normal Equation Question

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