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Keywords: Equilateral chord.svg Equilateral chord of a circle The earliest trigonometry was based on chords of a circle A chord of length equal to the radius made a natural base quantity for measuring angles Using the standard Babylonian sexagesimal divisions one sixtieth of this defined a degree; while six such chords complete the circle Own work using Inkscape 2007-10-10 Jheald Degree angle Chord geometry |