Геометрия 9 класс

Для справки

https://free-otvet.ru/30793530/%D0%BD%D0%B0%D0%B9%D0%B4%D0%B8%D1%82%D0%B5-%D1%80%D0%B0%D0%B4%D0%B8%D1%83%D1%81-%D0%BE%D0%BA%D1%80%D1%83%D0%B6%D0%BD%D0%BE%D1%81%D1%82%D0%B8-%D0%BA%D0%BE%D0%BE%D1%80%D0%B4%D0%B8%D0%BD%D0%B0%D1%82%D1%8B-%D0%B5%D0%B5-%D1%86%D0%B5%D0%BD%D1%82%D1%80%D0%B0-%D1%84%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D0%B0-x-2 здесь подробное решение