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Find the distance of the point veca from...

Find the distance of the point `veca` from the plane `vecr*hatn=d` measured parallel to the line `vecr=vecb+tvec(c)`.

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A line parallel to `vecc` and passing through
`A(veca)` is `vecr=veca+lamdavecc`
A point for some `lamda` satisfies plane
`" "(veca+lamdavecc)*hatn=d`
or `" "lamda=(vecd-veca*hatn)/(vecc*hatn)`
`therefore" "` Distance `= (|vecd-hata*hatn|)/(|vecc*hatn|)|vecc|`.
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CENGAGE PUBLICATION-THREE-DIMENSIONAL GEOMETRY -CONCEPT APPLICATION EXERCISE 3.3
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