The condition \frac {a1}{a2} = \frac{b1}{b2} = \frac{c1}{c2} is for the planes whose normals are _____ to each other.

(a) perpendicular

(b) parallel

(c) differential

(d) tangential

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Asked question is from Three Dimensional Geometry topic in division Three Dimensional Geometry of Mathematics – Class 12

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