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The concept of "Constant"

If a figure changes, there are some cases when the length and area change.
But there are other cases when those things do "not change".
It is natural to not change when things are not related to movement.
It is remarkable that some things are related to movement but do not change.
In this sense,
「not changing」and 「constant」
are one of the check points to find good problems.
And, although it is not constant everytime, it is constant with certain movements in some cases.
In other words, it is important to focus on with which movement it will be constant.

Forum of Geometric Constructor by Y.Iijima