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If veca, vecb and vecc are the position ...

If `veca, vecb and vecc` are the position vectors of the vertices A,B and C. respectively , of `triangleABC`. Prove that the perpendicualar distance of the vertex A from the base BC of the triangle ABC is `(|vecaxxvecb+vecbxxvecc+veccxxveca|)/(|vecc-vecb|)`

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