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If A,B,C represents the three sides of a...

If A,B,C represents the three sides of an equilateral triangle taken in the same order then find the angle between i) A and B ii) B and C iii) A and C.

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From the diagram the angle between the vectors `vecA and vecB` is `120^(@)` the angle between `vecB and vecC` is `120^(@)` the angle between `vecA and vecC` is `120^(@)`
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