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A_(1), A_(2), A_(3), ……,A_(n) are the vertices of a regular plane polygon of n slides and O is the centre then show that underset(i=1)overset(n-1)Sigma bar(OA_(i)) xx bar(OA)_(i+1) = (1-n) (bar(OA)_(2) xx bar(OA)_(1)) |
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