THE SANGAKU LOST FROM THE HAGURO SHRINE IN MURAKAMI

摘要

A mathematical tablet called sangaku was dedicated to the Haguro Jinjya (the Shinto shrine in Murakami in 1791). Although the sangaku was lost, fortunately it was recorded in a book Shinpeki Sanpou (the collection of sangaku problems). The sangaku is a historical work that shows the wasan (the traditional Japanese mathematics in the Edo period of Japan). Then, we try to restore the sangaku through the drawing by computer. Also, we present the solution in the Edo period to the sangaku problem.