TOT 459 1995 Spring S A4 lattice points and circle
Source:
July 9, 2024
geometrycombinatoricscombinatorial geometrylattice points
Problem Statement
Some points with integer coordinates in the plane are marked. It is known that no four of them lie on a circle. Show that there exists a circle of radius 1995 without any marked points inside.(AV Shapovelov)