: Features the Trisection of an Angle , the tangency problem of Apollonius, and Archimedes' determination of Pi ( ) .
: Includes Archimedes' Problema Bovinum (Cattle Problem) and Bachet de Méziriac’s weight problem.
: Focuses on optimization, such as Steiner’s ellipse and circle problems and the "Honeybee Cell" problem. Key Features
: Unlike recreational puzzle books, Dörrie provides rigorous, unabridged mathematical proofs for every single entry.