MAKE A MEME View Large Image Daizhen gougurongfang.jpg Dai Zhen （1724 - 1777） Square in a right angle triangle diagram 戴 句股容方图 18th century diagram Dai Zhen 1724-1777 PD-old 18th-century diagrams
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Keywords: Daizhen gougurongfang.jpg Dai Zhen （1724 - 1777） Square in a right angle triangle diagram 戴 句股容方图 18th century diagram Dai Zhen 1724-1777 PD-old 18th-century diagrams
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