11/29/2023 0 Comments Whats a chord geometry![]() ![]() The circle was of diameter 120, and the chord lengths are accurate to two base-60 digits after the integer part. In the second century AD, Ptolemy of Alexandria compiled a more extensive table of chords in his book on astronomy, giving the value of the chord for angles ranging from 1 / 2 to 180 degrees by increments of 1 / 2 degree. The first known trigonometric table, compiled by Hipparchus, tabulated the value of the chord function for every 7 + 1 / 2 degrees. In trigonometry Ĭhords were used extensively in the early development of trigonometry. The midpoints of a set of parallel chords of a conic are collinear ( midpoint theorem for conics).
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