[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) › c8.130 # Mathematics in Ancient and Medieval India c8.130 Mathematics in Ancient and Medieval India c8.130 - **Language:** English ### [c8.130](https://indike.org/pramana/ins.science.bag-1979.c8.130) (4) Let the two diameters BOB' and COC' of the circle of centre O cut each other at right angle (Fig. 21) Let P be any point on the quadrant COB' such that = A. Hence = 90° + A. Let S be the middle point of PB then SB is the Jyā of (90° + A)/2 - [Previous: c8.129](https://indike.org/pramana/ins.science.bag-1979.c8.129) - [Next: c8.132](https://indike.org/pramana/ins.science.bag-1979.c8.132) - [Up: c8](https://indike.org/pramana/ins.science.bag-1979.c8) --- Source: [https://indike.org/pramana/ins.science.bag-1979.c8.130](https://indike.org/pramana/ins.science.bag-1979.c8.130) · Pramāṇa