159332

Which polygons can make rings around a shape which uses only 1 side of each polygon?

pentagon(5-gon),hexagon(6-gon),octagon(8-gon),decagon(10-gon),(dodecagon(12-gon)

It forms a ring around every even number polygons and pentagon and except for square

Solution: 3 dodecagon = 36 divide 3 so it would equal a triangle.
12 sides interior angle 1800 and exterior 360
By drawing a line of symmetry you would need 1 and a half to make a half ring.

2n
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n-6