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The concept of "Which is which?"

For instance, when a figure is given and the question follows "which is the barycenter?",
it is likely to give a figure in which it can be clearly distinguished.
It is rare to be given a figure which is hard to see "which is which".
So, the context here may be a little strange.
Such as "I made circumcenter and barycenter, but I can't distinguish".
"You should be able to distinguish because you made it". Maybe you think so.
But in this context, it will become appropriate to think "if this is barycenter, it must move as follows".
In other words, these problems were made to have you think about these things.
In this sense, these problems can be posed with dynamic figure.

Forum of Geometric Constructor by Y.Iijima