[Pramāṇa](https://indike.org/pramana/) › [Studies](https://indike.org/pramana/ins) › [Science, technology and education](https://indike.org/pramana/ins.science) › [Indian Mathematics](https://indike.org/pramana/ins.science.kaye-1915) › c5.18 # Indian Mathematics c5.18 Indian Mathematics c5.18 - **Language:** English ### [c5.18](https://indike.org/pramana/ins.science.kaye-1915.c5.18) Again we have to remark the significant fact that none of these geometrical constructions occur in any later Indian work. The first two are direct geometrical applications of the rule c² = a² + b²; the third gives in a geometrical form the sides of the rectangle as a√2 and (a√2)/2; the fourth rule gives a geometrical construction for ab = (b + (a-b)/2)² - ((a-b)/2)² and corresponds to EUCLID, II, 5; the fifth is not perfectly clear but evidently corresponds to EUCLID, II, 4. - [Previous: c5.17](https://indike.org/pramana/ins.science.kaye-1915.c5.17) - [Next: c5.19](https://indike.org/pramana/ins.science.kaye-1915.c5.19) - [Up: c5](https://indike.org/pramana/ins.science.kaye-1915.c5) --- Source: [https://indike.org/pramana/ins.science.kaye-1915.c5.18](https://indike.org/pramana/ins.science.kaye-1915.c5.18) · Pramāṇa