In music, a chord is a group of three or more notes played together that sound harmonious. In geometry and engineering, a chord is a straight line connecting two points on a curve.
The musical “chord” is a shortened form of “accord,” meaning agreement or harmony. The geometric “chord” comes from Latin “chorda,” from Greek “khordē,” meaning string or gut.
Two different “chords”—music and geometry—look the same but have different family trees. A musical chord is about agreement between notes; a geometric chord is about a straight “string” across a curve. Both, in their own way, are about connecting points so they work together.
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