Mathematics in Ancient and Medieval India c8.s3.26

c8.s3.26

*Tantrasaṃgraha* adopts various approximations to (π)/4. Among these let us discuss the following two which have already been noted by Whish¹. The two approximations to the series (π)/4 are as follows: $i) (π)/4 = 1 - ⅓ + ⅕ - ... ± 1/n$ $((n+1)/2)/((n+1)² + 1) ......[T]$