a) integral
b) parallel
c) perpendicular
d) concentric
The condition a1a2 + b1b2 + c1c2 = 0 is for the planes whose normals are _____ to each other.
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The condition a1a2 + b1b2 + c1c2 = 0 is for the planes whose normals are _____ to each other.
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