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If veca = hatj + sqrt3hatk, vecb=- hatj ...

If `veca = hatj + sqrt3hatk, vecb=- hatj + sqrt3 hatk and vecc = 2sqrt3 hatk` form a triangle , then the internal angle of the triangle between `veca and vecb` is ___________________________________________

Text Solution

Verified by Experts

`veca.vecb = -1 + 3=2`
`|veca|=2,|vecb|=2`
` cos tehta = 2/(2xx2) = 1/2`
` theta= pi/3 ` but its value is `(2pi)/3` as it is opposite to the side of maximum length.
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