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Let the pair of vector `veca,vecb` and `vecc,veccd` each determine a plane. Then the planes are parallel ifA. `(vecaxxvecc)xx(vecbxxvecd)=vec0`B. `(vecaxxvecc).(vecbxxvecd)=vec0`C. `(vecaxxvecc)xx(veccxxvecd)=vec0`D. `(vecaxxvecc).(veccxxvecd)=vec0` |
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Answer» Correct Answer - c `veca xx vecb` is a vector perpendicular to the plane containing `veca and vecb` similarly, `vecc xx vecd` is a vector perpendicular to the plane containing , `vecc and vecd` thus , the two planes will be parallel if their normal i.e., `veca xx vecb and vecc xx vecd` are parallel. thus `(veca xx vecb) xx (vecc xx vecd)) = vec0` |
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