Відповіді: Стр.133 (Pr)

Project.

Give a presentation! Choose a famous Ukrainian scientist and present the information.

Name: Ihor Sikorskyi. Date of birth: 1889. Place of birth: Kyiv, Ukraine. Achievements: He built his first helicopters in 1909 and 1910 and later developed successful designs. Most famous for: His work on helicopters.