Yes. They meet at the orthocentre.
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No, they meet at a single point.
intersection of the lines drawn perpendicular to each side of the triangle through its midpoint
Yes - except in the extreme case where they are the same line.
They are the lines joining each of the vertices to the mid-points of the opposite sides. In an equilateral triangle, these lines are the medians, angle bisectors, altitudes and perpendicular bisectors of the sides - all in one!
The three lines joining each vertex to the midpoint of the opposite side. They are also the medians, altitudes and perpendicular bisectors of the sides. In an equilateral triangle these are coincident.