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Petersen–Morley theorem : ウィキペディア英語版 | Petersen–Morley theorem In geometry, the Petersen–Morley theorem states that, if , , are three general skew lines in space, if , , are the lines of shortest distance respectively for the pairs , and , and if , and are the lines of shortest distance respectively for the pairs , and , then there is a single line meeting at right angles all of , , and . The theorem is named after Julius Petersen and Frank Morley. ==References==
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