Year 8 are about to meet the formula for the circumference of a circle. The teacher has built a short Sutori story with six entries: early estimates from Babylon and Egypt, Archimedes trapping pi between 223/71 and 22/7 with 96-sided polygons, Liu Hui's polygons in third-century China, Zu Chongzhi's fraction 355/113, Madhava's infinite series in fourteenth-century Kerala, and computers finding trillions of digits today. Students scroll through and read each entry with its images at their own pace, then close the story and answer five questions in their books, such as why a polygon with more sides gives a closer estimate. The teacher goes through the answers and uses the polygon idea to introduce C = πd.
This page is one of a growing set of PICRAT examples by cell, subject and grade. Page maintained by Andy Perryer.