Homework Help: maths vector

Posted by Anonymous on Saturday, March 16, 2013 at 11:25am.

if a vector+ b vector+ c vector =0, & a vector=3, b=5, c=9, find angle between a & b vector

maths vector - Reiny, Saturday, March 16, 2013 at 12:42pm
They must form a triangle with sides 3,5, and 9

but that is an impossible triangle since
3+5 < 9

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