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It depends on what the coordinates of the first three vertices are!
Three coordinates suffice to define a location in space. On a surface only two coordinates are required.
The coordinates of a point two units to the right of the y-axis and three units above the x-axis would be (2,3).
Spot elevation coordinates typically consist of a three-digit number representing the elevation value, followed by three additional digits representing the location. In this case, the six-digit coordinates for spot elevation 210 would likely be something like 210XXX, where XXX represents the specific location identifier. These coordinates are used in surveying and mapping to pinpoint specific elevation points on the earth's surface with precision.
If the coordinates of the three vertices are (xa, ya), xb, yb) and (xc, yc) then the coordinates of the centroid are [(xa+xb+xc)/3, (ya+yb+yc)/3].