Джерела

URL:https://uk.wikipedia.org/wiki/%D0%9F%D0%BB%D0%BE%D1%89%D0%B0_%D0%BA%D1%80%D1%83%D0%B3%D0%B0

URL:https://uk.wikipedia.org/wiki/%D0%93%D1%96%D0%BF%D0%BF%D0%BE%D0%BA%D1%80%D0%B0%D1%82%D0%BE%D0%B2%D1%96_%D1%81%D0%B5%D1%80%D0%BF%D0%BA%D0%B8

URL:http://zno.academia.in.ua/mod/book/view.php?id=3039&chapterid=710

URL:https://miyklas.com.ua/p/geometria/9/pravilnimnogokutniki-dovzhina-kola-ta-ploshcha-kruga-15519/dovzhina-kola-i-ploshcha-kruga-15522/re-d4e9ddab-b641-4659-845c-f5cd37786eee

URL:https://www.youtube.com/watch?v=vogfM-qImgU&list=PLBRiIlOLbG9bPvZ1dAmW7QI-lmPupTsFO&index=4&t=0s

URL:https://subject.com.ua/mathematics/zno/421.html

URL:https://www.youtube.com/watch?v=MV_geY1l6eQ

URL:https://www.youtube.com/watch?v=m5TkFLAeeF4