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If a→, b→ and c→ are the position vectors of the vertices A, B and C respectively of a ∆ABC such that a→×b→+b→×c→+c→×a→=20, then area of ∆ABC is ____________.

Answer» If a, b and c are the position vectors of the vertices A, B and C respectively of a ABC such that a×b+b×c+c×a=20, then area of ABC is ____________.


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