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[Post New]6 Jan 2008 18:39:04 IST
    Subject: Re:if three vectors a,b,c satisfy a+b+c=0,thenangle between a&bis
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karthik_abiram (1222)

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Olaaa!! Perrrfect answer. 216  [287 rates]
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if three vectors a,b,c satisfy a+b+c=0,thenangle between a&b is    
======
SOLUTION:-
a + b = - c
 
Squarring,
 
[ a + b ] = c2
 
a2 + b2 + 2 a . b = c2
 
a2 + b2 + 2 | a || b | cos @ = c2
 
cos@ =  [c2 - a2 + b2 ] / 2ab
 
Cheers !
 
 
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