Mathematics in Ancient and Medieval India c8.51

c8.51

II. 'Twice any desired arc is substracted from 90°; the *Jyā* of the remainder is subtracted from the radius. The square-root of the result multiplied by sixty (i.e. half, of the radius) is the *Jyā* of that arc. By deducting that square (i.e. Jya²A) from the square of the radius, the square of *Kojyā* is obtained.¹