Rotatable tower
The rotatable tower situated in the city center has the ground shape of a regular polygon. If the tower is rotated by 18° around its centerpiece, it looks from the side same. Your task is to calculate at least how many vertices can have a ground plan view of the tower.
Correct answer:

You need to know the following knowledge to solve this word math problem:
arithmeticsolid geometryplanimetricsUnits of physical quantitiesGrade of the word problem
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