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5 votes
Regular Polygons multiple choice
I think it's a - 60 but I'm not sure

Regular Polygons multiple choice I think it's a - 60 but I'm not sure-example-1
User Cerzi
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1 Answer

2 votes
Yes you are correct. An equilateral triangle would combine with the dodecagon (12 sided polygon) and the square to help tessellate the plane. 
User Guig
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