3D - 2

........................3d.........?

condition when two planes are parallel to each other ? and perpendicular????

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1. The two planes a₁x + b₁y + c₁z + d₁ = 0, a₂x + b₂y + c₂z + d₂ = 0 (1) are Parallel to each other iff : a₁ : a₂ = b₁ : b₂ = c₁ : c₂ (2) are Mutually Perpendicular iff : a₁a₂ + b₁b₂ + c₁c₂ = 0. ___________________________ Happy To Help ! ____________________________