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If veca,vecb,vecc are position vectors o...

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) |vecaxxvecb+vecbxxvecc+veccxxveca|`. Also deduce the condition for collinearity of the points A,B and C.

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