It should be 1 circle 3 times.

This involves the angle problem. The fillet of a circle is 360 degrees. Simply put, if a circle wants to turn an angle, it must turn a certain angle at the vertex of the angle. At this time, although the circle has turned, the position has not changed, and it is the same in the circle. Therefore, the small circle only needs to turn once in the big circle, which may be difficult for you to understand, but it should be easier to understand if you turn three times outside the circle. One lap inside, three laps outside. It can't be calculated by perimeter. take for example

The circumference of a circle is equal to the side length of a regular triangle. How many times does the circle rotate around the regular triangle?

The answer is four weeks.

In addition to the perimeter, it has to be 360 degrees around the outer corner and that place, which is one week, so even those three circles are * * * around four times. This is also related to the angle, so it can't be calculated by the circumference.

This is what the teacher said, which is absolutely correct.