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Distance between a point and a plane

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Distance L between a point (x1, y1, z1) and a plane ax+by+cz+d=0 in 3D space :

L = | ax1 + by1+ cz1 + d | / (a©÷+ b©÷+ c©÷)^(1/2)


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L = abs( a*x1 + b*y1+ c*z1 + d ) / (a^2 + b^2 + c^2 )^(1/2)
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