Distance of point `P(vecP)` from the plane `vecr.vecn=0` is
Distance of point `P(vecP)` from the plane `vecr.vecn=0` is
A. `|vecp.vecn|`
B. `(|vecpxxvecn|)/(|vecn|)`
C. `(|vecp.vecn|)/(|vecn|)`
D. none of these
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Correct Answer - c
Let `Q(vecq)` be the foot of altitude drawn from P to
the plane `vecr.vecn=0`. Then
`vecq-vecp=lamdavecnorvecq=vecp+lamdavecn`
Also `vecq.vecn=0implies(vecp+lamdavecn).=0`
or `lamda=-(vecp.vecn)/(|vecn|^(2))orvecq-vecp=-(vecp.vecn)/(|vecn|^(2))vecn`
Thus, required distance `=|vecq-vecp|=(|vecp.vecn|)/(|vecn|)=(|vecp.vecn|)`
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