Locus of centroid of tetrahedron, The angle between the plane, perpendicular Distance from the origin to the plane, The equation of plane passing through the intersection of plane

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Find the equation of plane passing through the points (2,3,-4).....

Find the equation of plane passing through the point (2,2,1),(9,3,6) and perpendicular to the plane ....................................

Plane,Definition of plane, Normal to a plane , Formula 8 to 15

Plane,Definition of plane, Normal to a plane , Formula 1 to 6