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If vec d= vec axx vec b+ vec bxx vec c+...

If ` vec d= vec axx vec b+ vec bxx vec c+ vec cxx vec a` is non-zero vector and `|( vec d * vec c)( vec axx vec b)+( vec d* vec a)( vec bxx vec c)+( vec d*vec b)( vec cxx vec a)|=0,` then
a.`| vec a|=| vec b|=| vec c|`
b. `| vec a|+| vec b|+| vec c|=|d|`
c. ` vec a , vec b ,a n d vec c` are coplanar
d. none of these

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