[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [Mathematics in Ancient and Medieval India](https://indike.org/pramana/ins.science.bag-1979) › c8.s3.26 # Mathematics in Ancient and Medieval India c8.s3.26 Mathematics in Ancient and Medieval India c8.s3.26 - **Language:** English ### [c8.s3.26](https://indike.org/pramana/ins.science.bag-1979.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) ......\[T\]$ - [Previous: c8.s3.25](https://indike.org/pramana/ins.science.bag-1979.c8.s3.25) - [Next: c8.s3.27](https://indike.org/pramana/ins.science.bag-1979.c8.s3.27) - [Up: c8.s3](https://indike.org/pramana/ins.science.bag-1979.c8.s3) ## Cites (1) - [Tantrasaṅgraha](https://indike.org/pramana/in.astro.kerala.tantra.tantrasangraha) — Nīlakaṇṭha Somayājī 1500, Sanskrit --- Source: [https://indike.org/pramana/ins.science.bag-1979.c8.s3.26](https://indike.org/pramana/ins.science.bag-1979.c8.s3.26) · Pramāṇa