The development of geometry and mathematics at the Maragha Observatory

Writing about the remarkable Azerbaijani scientist Nasiraddin Tusi, who has a great scientific heritage, is very res-ponsible and honorable. Tusi, who has a very significant place in the world encyclopedia together with well-known pheno-menal scientists, is one of the most honorary personalities of our nation. It may be named precious stone of the Academy of Sciences in the East. Tusi has masterpieces about mathematics, geometry, astronomy, geography and ethics and he is an inventor of a lot of unique inventions and discoveries. According to the scientist, America had been discovered hundreds of years ago. Unfortunately, most peoples don¿t know this fact. I want to inform readers about Tusi¿s achievements by means of this work. The most well-known works of the scientist are ¿Shaklul-qitä (¿Treaties about the perfect four-side¿), ¿Jame ul-hesab¿ (¿Collection of Counts¿), ¿Measure of Circle¿, ¿Tahriru Uglidis¿ (¿Recension of Euclid¿s Elements¿).His works have played a sig-nificant role in development of geometry and trigo-nometry in the East and Europe.