In the triangle ABC with vertices A (2, ...

In the triangle ABC with vertices A (2, 3), B (4,-1) and C (1, 2), find the equation and length of altitude from the vertex A.

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In the triangle with vertices A (2, 3), B (4, -1) and C (-1,2), find the equation and length of the altitude from the vertex A.

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For the triangle ABC whose vertices are A (-2, 3), B (4, - 3) and C (4, 5), find the equation of : the st. line through A parallel to the opposite side BC.

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