Arc and Arrow

Jyaavyaasayogaanthara ghaathamoolam vyaasasthadoono dalitha:

sara: syaath vyaasaaccharonaacchara sangunaa cha moolam

dvinighnam bhavatheeha geevaa yeevaardhavarge sarabhaktha

yukthe vyaasapramaanam pravadanthi vrutthe

  When the sum and differences of diameter and the chord are multiplied, and their square root is taken and if half of that is subtracted from the diameter, the arrow is obtained. The difference of diameter and the arrow multiplied with the arrow, twice the square root of that value gives the chord. The square of half the chord divided by arrow and added with arrow gives the diameter of the circle.]]>