Two planes are perpendicular if:
ADifferent d
BParallel
CSame plane
DNormal vectors perpendicular: n₁ · n₂ = 0
Answer & Solution
Correct answer: D. Normal vectors perpendicular: n₁ · n₂ = 0
Two planes perpendicular iff normals perpendicular. For planes a₁x+b₁y+c₁z=d₁ and a₂x+b₂y+c₂z=d₂: a₁a₂+b₁b₂+c₁c₂ = 0.
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