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The condition a1a2 + b1b2 + c1c2 = 0 is for the planes whose normals are _____ to each other.

The condition a1a2 + b1b2 + c1c2 = 0 is for the planes whose normals are _____ to each other. Correct Answer perpendicular

θ = 90 degrees ⇒ cos θ a1a2 + b1b2 – c1c2 = 0 Relation between the planes a1x + b1y + c1z + d1 = 0 and a2x + b2y + c21z + d2 = 0, if their normal are perpendicular to each other is a1a2 + b1b2 + c1c2 = 0.

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