Sorry, but I do not understand what you mean. Calculate two times and two times ?
How do I end up with one centroid point then?
i drew the graph. one of the points lie on the complex plane . your triangle has the following points (0,0),(2,sqrt(2)),(2,i.sqrt(2)). so you cannot find the centroid on the real plane. or if you want to find out then some imaginary part will stay behind.