They are significant in that they contain the first instance of trigonometric relations based on the half-chord, as is the case in modern trigonometry, rather than the full chord, as was the case in Ptolemaic trigonometry.
Son significativos porque conteñen o primeiro caso das relacións trigonométricas baseadas en media corda, como na trigonometría moderna, en lugar da corda completa, como na trigonometría ptolemaica.