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Question
In triangle ABC, which of the following is not true?
Options
`bar(AB) + bar(BC) + bar(CA) = bar0`
`bar(AB) + bar(BC) - bar(AC) = bar0`
`bar(AB) + bar(BC) - bar(CA) = bar0`
`bar(AB) - bar(CB) + bar(CA) = bar0`
MCQ
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Solution
`bb(bar(AB) + bar(BC) + bar(CA) = bar0)`
Explanation:
By triangle law of vector addition
`bar(AB) + bar(BC) = bar(AC)`
or `bar(AB) + bar(BC) = -bar(CA)`
or `bar(AB) + bar(BC) + bar(CA) = bar0`
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