The Shulbasutras of Baudhayana, Apastamba, Katyayana and Manava: With Text, English Translation and Commentary c7.25

c7.25

If it is desired to transform a square into a circle, (a cord of length) half the diagonal (of the square) is stretched from the centre to the east (a part of it lying outside the eastern side of the square); with one-third (of the part lying outside) added to the remainder (of the half diagonal), the (required) circle is drawn.