Answers

2014-05-04T19:42:44+05:30
Dude   any closed shape that a vector makes  ................. the resultant is always  zero
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2014-05-04T21:43:50+05:30
In a pentagon you consider the sides as vectors. you see that each vector starts at one vertex and ends at the adjacent vertex. so the fifth one ends at the point where the first one started, hence the sum of the vectors is zero.
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