Abstract
SANGAKU is a wooden board dedicated to the temple and shrines with written math questions and answers. This paper is a report of three SANGAKU we investigated in 2021. The first was dedicated to Hayama Shrine in Ishinomaki City in1884.
The second was dedicated to Kusushi Shrine in Ishinomaki City in 1887. The third was dedicated to Yokokura-Atago Shrine in Kakuda City in 1882.These are not well known, because they are not listed in the collection of SANGAKU materials. We surveyed these SANGAKU, took pictures with digital camera and infared camera, and checked the characters visually. In this paper, we will present the survey summary, consideration on some math questions, reprints, and infrared photo of figures.
