That depends on where the triangle ABC is located on the Cartesian plane for the coordinates of its vertices to be determined.
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It is the sum of the y-coordinates of the vertices divided by the number of vertices.
It depends on what the coordinates of the first three vertices are!
Use the coordinates of the vertices.
The answer depends on the other two vertices. Two vertices define an infinite number of parallelograms.
Any side: you can select the order in which the vertices are named!