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If veca,vecb,vecc are unit vectors such ...

If `veca,vecb,vecc` are unit vectors such that `veca+vecb+vecc` = `vec0`, find the value of `veca.vecb+vecb.vecc+vecc.veca`.

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Three vectors veca, vecb and vecc satisfy the condition veca + vecb + vecc = 0 . Find the value of veca.vecb + vecb.vecc + vecc.veca if |veca| = 1, |vecb|= 4, |vecc|= 2 .

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