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.
To determine the coordinates of the fourth vertex of a rectangle, you need to know the coordinates of the other three vertices. If you have the coordinates of three vertices, you can find the fourth by using the properties of a rectangle, where opposite sides are equal and the diagonals bisect each other. For example, if the vertices are A(x1, y1), B(x2, y2), and C(x3, y3), you can find the fourth vertex D(x4, y4) through the midpoint formula or by ensuring that the lengths of the sides and the diagonals are consistent. Please provide the coordinates of the existing vertices for a specific answer.