The first reason is that the definition of potential diagram is: if two graphs are not only similar graphs, but also the straight lines of each group of corresponding points pass through the same point, then such two graphs are called potential diagrams.

The reason for the second mistake is that two polygons with equal angles and proportional sides are called similar triangles.

The reason for the third pair is that both triangles are equal, so the ratio of their corresponding sides is one to one, so the similarity ratio is one.

The fourth right reason is: because of AB? =AC×BC, so AB∶AC=BC∶AB, so point B is the golden section of line segment AC.