A circle is divided into $3k $ arcs using $3k$ dots.
90184
Partition of circumference into $3k$ arcs
34593
Black and white beads on a circle
150522
Do circles divide the plane into more regions than lines?
115677
Prove the equality of circle's areas
32909
3/4 circle with plus in it?
24730
A circle has the same center as an ellipse and passes through the foci $F_1$ and $F_2$ of the ellipse, two curves intersect in $4$ points.
123939
N circles in the plane
22540
Bisecting line segments in a tetrahedron.
28877
Graph with $k$ components.
131919
Vertices of equilateral triangle inscribed in the unit circle
76001
Construct a fourth circle tangent to 3 circles forming a tangency chain
82327
Tiling a $3 \times 2n$ rectangle with dominoes
99714
Expected area of the intersection of of triangles made up random points inside a circle, all the triangles must contain the origin
154864
Finding the radius of a third tangent circle
23395
Calculating circle radius from two points and arc length
36442
Expected area of triangle formed by three random points inside unit circle
70761
Number of ways to connect sets of $k$ dots in a perfect $n$-gon