Q. What are polygons and symmetry explain broadly? 

Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/what-are-polygons/visualising-solid-shapes/3369490 
Symmtery:
symmetry means that one shape becomes exactly like another when you move it in some way: turn, flip or slide. For two objects to be symmetrical, they must be the same size and shape, with one object having a different orientation from the first.

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