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立方体倍積問題
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Wikipedia definition
1. Doubling the cube​Doubling the cube (also known as the Delian problem) is one of the three most famous geometric problems unsolvable by compass and straightedge construction. It was known to the Egyptians, Greeks, and Indians. To "double the cube" means to be given a cube of some side length s and volume V= s, and to construct the side of a new cube, larger than the first, with volume 2V and therefore side length .
Read “Doubling the cube” on English Wikipedia
Read “立方体倍積問題” on Japanese Wikipedia
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