Constructing a circle from a square
2786
The staircase paradox, or why $\pi\ne4$
157171
Gauss circle problem : a simple asymptotic estimation.
42034
Gluing a Möbius strip into a sphere.
109290
How to find the smallest enclosing circle over a set of circles?
148154
Make square image
140372
Mixing rounded corners and square corners
137146
How to round the edges of this object?
56832
Drawing discs with circular holes with TikZ
132831
A circle with infinite radius is a line
102297
Construction of a regular pentagon
25328
I need to turn one side of a cylinder into a square a leave the other side round
57992
choosing points interior to a square
121923
Best way to find a point on a circle closest to a given point
73867
Radius of circumscribed circle of triangle as function of the sides
34593
Black and white beads on a circle
63802
Parametric Equation of a Circle Using a Line
55766
Radius of a circle touching a rectangle both of which are inside a square