Regional Olympiad - FBH 2018 Grade 9 Problem 4
Source: Regional Olympiad - Federation of Bosnia and Herzegovina 2018
September 18, 2018
analytic geometrygeometrycombinatorics
Problem Statement
Prove that among arbitrary points in plane with coordinates as integers, such that no three are collinear, we can pick three points as vertices of triangle such that its centroid has coordinates as integers.