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If veca,vecb,vec c are position vectors...

If `veca,vecb,vec c` are position vectors of the non- collinear points A, B, C respectively, the shortest distance of A from BC is

A

`bara.|barb-barc| bara`

B

`sqrt(|barb-bara|^2-{bara.barb/barc}^2)`

C

`|barb-bara|`

D

None of these

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