Jisho

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Noun
1. arc lengthMathematics
Wikipedia definition
2. Arc lengthDetermining the length of an irregular arc segment is also called rectification of a curve. Historically, many methods were used for specific curves. The advent of infinitesimal calculus led to a general formula that provides closed-form solutions in some cases.
Read “Arc length” on English Wikipedia
Read “弧長” on Japanese Wikipedia
Read “Arc length” on DBpedia

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