Lesson plan

Chord function

The term chord function may refer to: * Diatonic function – in music, the role of a chord in relation to a diatonic key; * In mathematics, the length of a chord of a circle as a trigonometric function of the length of the corresponding arc; see in particular Ptolemy's table of chords.

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Article summary

The term chord function may refer to: * Diatonic function – in music, the role of a chord in relation to a diatonic key; * In mathematics, the length of a chord of a circle as a trigonometric function of the length of the corresponding arc; see in particular Ptolemy's table of chords.

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Discussion questions

  1. Summarise the article in your own words. Which single claim would you verify first, and why?
  2. Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
  3. If two sources disagreed about one of these facts, what would you need in order to trust one over the other?

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