The author's main example is with the hats of the Belu of central Timor, but he notes that related techniques are used in northern Mozambique, southern Tanzania, and by the Kuva of Congo. The author also shows a Chinese hat with five-fold symmetry. Five Fold Symmetry , Mozambique , Malaysia , and The Belu of Central Timor . Make comment on this entry Gerdes, Paulus. Three alternate methods of obtaining the ancient Egyptian formula for the area of a circle.
All methods are empirical.
Make comment on this entry Gerdes, Paulus and Bulafo, Gildo. Technology, art and geometry in Inhambane. Translated from the Portuguese by Arthur B. Powell and Gerdes. The authors discuss the construction and mathematical properties of the Mozambican sipatsi , which are essentially woven handbags. They are generally decorated with strip or frieze patterns, and in fact all 7 possible types of strip patterns occur in the sipatsi from Inhambane province in Mozambique.