document.write( "Question 1114600: How to prove that a*b=|a||b|, if a and b are two vectors in the same direction.
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Algebra.Com's Answer #729940 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
By definition,
\n" ); document.write( " $\"a%2Ab=abs%28a%29%2Aabs%28b%29%2Acos%28theta%29\"$
\n" ); document.write( "Substituting,
\n" ); document.write( " $\"abs%28a%29%2Aabs%28b%29=abs%28a%29%2Aabs%28b%29%2Acos%28theta%29\"$
\n" ); document.write( " $\"cos%28theta%29=1\"$
\n" ); document.write( " $\"theta=0\"$
\n" ); document.write( "So angle between the two vectors is zero and they are pointed in the same direction.
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