The condition a1a2 + b1b2 + c1c2 = 0 is for the planes whose normals a – McqOptions

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1.	The condition a₁a₂ + b₁b₂ + c₁c₂ = 0 is for the planes whose normals are _____ to each other.
A.	integral
B.	parallel
C.	perpendicular
D.	concentric
Answer» D. concentric

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