public void FlipVertical()
{
var minY = Min(Vertex1.Y, Vertex2.Y, Vertex3.Y);
var maxY = Max(Vertex1.Y, Vertex2.Y, Vertex3.Y);
var reltiveYCoordinate = (minY + maxY) / 2.0;
Vertex1.FlipVertical(reltiveYCoordinate);
Vertex2.FlipVertical(reltiveYCoordinate);
Vertex3.FlipVertical(reltiveYCoordinate);
}