Prob. 2.10 in Bourne & Kendall: These four points lie on a circle
115801
Show that four points given by vectors lay on a circle
62525
Find the equation of the circle passing through two points (4,4) and (-2.-2) with radius 4
111626
probability of three random points inside a circle forming a right angle triangle
94051
How to show that all points are inside of unit circle?
150608
problem on intersecting circles
69679
Geometric interpretation for sum of fourth powers
65522
The wedge sum of two circles has fixed point property?
67460
Orientation on $\mathbb{CP}^2$
118501
Proving the length of a circle's arc is proportional to the size of the angle
106050
Finding a conformal map from the intersection of two disks to the unit disk.
37589
Connectedness of points with both rational or irrational coordinates in the plane?
83596
A simple proof that a polygon circumscribing a circle overestimates its perimeter
37448
Two Circles and Tangents from Their Centers Problem
123939
N circles in the plane
64504
Prove that the point of intersection of the diagonals of the trapezium lies on the line passing through the mid-points of the parallel sides
37056
A Polygon is inscribed in a circle $\Gamma$
128679
How to determine if two points lie on a vector, given a unit vector