From: utzoo!decvax!duke!harpo!npoiv!alice!rhm Newsgroups: net.math Title: another construction problem Article-I.D.: alice.829 Posted: Mon Aug 2 12:40:38 1982 Received: Tue Aug 3 00:47:02 1982 Given five points that lie on a circle, construct with straightedge alone, a sixth point that also lies on the same circle. [The circle is not given, of course, only the five points] [A straightedge has no marks and cannot be marked - it only finds the line joining two points]