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What is a gyrational square in this context?
This is a diagram of quadrilaterals and their duals. Within this diagram, there is a square (shown with 8 lines of symmetry) and right below that there is a "gyrational square" shown with no ...
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Is every triangle a quadrilateral?
I can imagine a quadrilateral where one of the angles is $180^\circ$. Is this still considered a quadrilateral?
More generally, is every $n$-gon also a $(n+1)$-gon (for $n \ge 3$)?
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