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;Plane equation
;Plane equation
:The canonical equation for a [http://mathworld.wolfram.com/Plane.html plane] in 3D is :
:The canonical equation for a [https://mathworld.wolfram.com/Plane.html plane] in 3D is :
::a * x + b * y + c * z + d = 0
::a * x + b * y + c * z + d = 0
:where (a, b, c, d) are 4 real numbers. The plane is the set of points (x, y, z) verifying that equation.
:where (a, b, c, d) are 4 real numbers. The plane is the set of points (x, y, z) verifying that equation.
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