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A (-1,4),B[1,-4) and C(5,4) are the vert...

A (-1,4),B[1,-4) and C(5,4) are the vertices of a triangle.Then,the length of the altitude from A onto BC is
(A) `(12)/(5)` (B) `(12)/(sqrt(5))` (C) `(12)/(5sqrt(5))` (D)3

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