Vertex
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Verticy, or vertices
I think it's circumcenter of the triangle if you stare at the question long enough. Like where the the three ?vertices? are meeting in the middle.
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!
A scalene triangle. The sides are all different lengths -- 5, 2sqrt(5) and sqrt(5)
parallelogram