 * p 178: China:  Tsu ChlungChih aka Zu Chongzhi  circa 480 AD:  got to six digits 3.141592; held world record for 800 years; however was not widely known during that period; even in China it was unknown until rediscovered in 14th c. * p 179: India:  in 499 AD astonomer Aryabhata  in his work Aryabhatiya  had value 3.1416.  Not clear if he invvented that; or adopted it as an import from Greece/Archimedes.  * p 180:  Brahmagupta circat 650 AD treated pi with  value  pi = sqrt(10)