Zenodorus
zenodorus(second century BCE) represents a new departure in the Euclidean tradition. Instead of proving direct proportions, as earlier mathematicians had done, he worked with inequalities and larger area well as could be done the tools to him, that a regular a than any other of the same perimeter and the same number of sides, that the more sides a regular polygon of a given perimeter has, the greater the area it encloses. and that a circle encloses a larger area than any polygon whose perimeter equals the circumference ofthe circle He also established similar theorems for polyhedra and spheres. These isoperimetric problems are not found in Euclid or Apollonius, and Archimedes only hints at them when he points out the need to assume that a convex curve enclosing another convexcurve must be longer than the one it encloses These results of Zenodorus are known because Theon of Alexandria quoted them in his commentary on peolemy's syntaxis. Pappus borrowed freely from his work problems.