unmarked ruler diameter of circumcircle at 7 steps construction
Source: 2017 Oral Moscow Geometry Olympiad grades 10-11 p3
July 25, 2019
geometrycircumcircleconstructionRuler
Problem Statement
On the plane, a non-isosceles triangle is given, a circle circumscribed around it and the center of its inscribed circle are marked. Using only a ruler without tick marks and drawing no more than seven lines, construct the diameter of the circumcircle.