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[" 2."A_(1),A_(2),............A_(n)" are the vertices of a regular plane "],[" polygon with "n" sides and "Q" is its centre.Show that "],[sum_(i=1)^(n-1)(vec OA_(i)timesvec OA_(i+1))=(1-n)(vec OA_(2)timesvec OA_(1))quad (1982-2" Marks) "]

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