Can a Circle be called a polygon with infinite number of sides?
134805
How many sides does a circle have?
100939
Circle with two borders
62518
How many rectangles or triangles.
142480
Creating a 'brick wall' style for polygons
18482
Can the squares with side $1/n$ be packed into a $1 \times \zeta(2)$ rectangle?
128716
Intuitive/direct proof that a rectangle partitioned into rectangles each with at least one integer side must itself have an integer side
56557
How to Create a Grid Inside a Polygon that is Oriented with the Longest Side?
46379
How can I draw a spiral that gets arbitrary close to a unit circle?
93245
Creating circle in PostGIS?
73578
Do infinitely many points in a plane with integer distances lie on a line?
58975
How many rectangles can be obtained by joining four of the $12$ vertices of a $12$-sided regular polygon?
36888
How to prove that the limit of an $n$-gon is a circle?
15700
How to calculate how many polygons I can put inside a polygon?
110638
Polygon with balls as corners
78407
Are there infinitely-many numbers that are both square and triangular?
103714
Progressively filled circles
98714
TikZ: Having circle borders only grown to the outside