This paper is a survey report of sangaku dedicated to Jakusyo-ji Kannon-do in Tendo city, Yamagata prefecture. It was dedicated to this kannon-do in 1864 and supported by HATTORI Take-emon and others. We have infrared photographic pictures that are clear and useful. And we also introduce sangaku transmitted to Kumano-jinja in Sagae city, Yamagata prefecture. It is a sangaku created under the initiative of HATTORI Take-emon too.

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SANGAKU is a wooden board dedicated to the temple and shrines with written math questions and answers. This paper is a report of six SANGAKU that we investigated in 2022. Five of them are SANGAKU dedicated to Kosai Kashima Shrine in Marumori Town, Igu District, Miyagi Prefecture from 1848 to 1900. From these, we can learn about the teacher student relationship of those who learned Wasan in the Kosai area from the late 19th century to the early 20th century. The last one is a SANGAKU dedicated to Okino Hachiman Shrine in 1867. This SANGAKU has a drawing of SANGI, sticks used for calculations, in the explanation of the math problem. We have never seen like this before and it is very rare. We surveyed these SANGAKU, took pictures with digital camera and inf r ared camera, and checked the characters visually. In this paper, we will present the survey summary, consideration on some math questions, repri nts, and infrared photo of figures.

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