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If veca , vecb , vecc are positi...

If `veca , vecb , vecc` are position vectors of the vertices A, B, C of a triangle ABC, show that the area of the triangle ABC is `1/2 ​ [ veca × vecb + vecb × vecc + vecc × veca ]`. Also deduce the condition for collinearity of the points A, B and C.

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