1.

The length of the perpendicular from the origin to the plane passing through the points `veca` and containing the line `vecr = vecb + lambda vecc` isA. `([vecavecbvecc])/(|vecaxxvecb+vecbxxvecc+veccxxveca|)`B. `([vecavecbvecc])/(|vecaxxvecb+vecbxxvecc|)`C. `([vecavecbvecc])/(|vecbxxvecc+veccxxveca|)`D. `([vecavecbvecc])/(|veccxxveca+vecaxxvecb|)`

Answer» Correct Answer - c
The given plane passes through `veca` and is parallel to the vectors `vecb-vecaandvecc`. So it is normal to
`(vecb-veca)xxvecc`. Henec, its equation is `(vecr-veca).((vecb-veca)xxvecc)=0`
or `vecr.(vecbxxvecc+veccxxveca)=[vecavecbvecc]`
The length of the perpendicular from the origin to this plane is
`[vecavecbvecc]/(|vecbxxvecc+veccxxveca|)`


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