[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [A History of the Kerala School of Hindu Astronomy (in Perspective)](https://indike.org/pramana/ins.science.sarma-1972) › c8.s5.6 # A History of the Kerala School of Hindu Astronomy (in Perspective) c8.s5.6 A History of the Kerala School of Hindu Astronomy (in Perspective) c8.s5.6 - **Language:** English ### [c8.s5.6](https://indike.org/pramana/ins.science.sarma-1972.c8.s5.6) r = √(((ab+cd)(ac+bd)(ad+bc))/((a+b+c-d)(b+c+d-a)(c+d+a-b)(d+a+b-c))) - [Previous: c8.s5.5](https://indike.org/pramana/ins.science.sarma-1972.c8.s5.5) - [Next: c8.s5.7](https://indike.org/pramana/ins.science.sarma-1972.c8.s5.7) - [Up: c8.s5](https://indike.org/pramana/ins.science.sarma-1972.c8.s5) --- Source: [https://indike.org/pramana/ins.science.sarma-1972.c8.s5.6](https://indike.org/pramana/ins.science.sarma-1972.c8.s5.6) · Pramāṇa