How many triangles are formed by $n$ chords of a circle?
46469
$n$ Lines in the Plane
12667
How many subgroups of order $n$ does $D_n$ have?
42852
The legs of a right triangle with given hypotenuse and radius of inscribed circle
85650
Number or regions formed when $n$ points on a circle are joined
69800
Construction of a right triangle
44811
Intersection of Common Chords of Three Circles
74114
How to find the number of anti-symmetric relations?
134805
How many sides does a circle have?
147197
Number of connected components of the complement of a compact
117330
What is the name of a squircle with three, five, six or more corners?
93252
Prove that the common chord passes through the origin.
44070
Recurrence  for number of regions formed by diagonals of a convex polygon.
70761
Number of ways to connect sets of $k$ dots in a perfect $n$-gon
63074
The equation of a family of circles passing through two given points
152107
Classic Circle and Adjacent Arrangement Problem
44795
Sum of areas of triangles which have corners which are lattice points with 74 lattice points inside.
37754
Number of vertices of a complete graph with $n$ edges