18. ๐ฐ๐ฐ๐ฐฝ๐ฐ๐ฐ๐ฐบ๐ฐบ๐ฐฝ๐ฐ ๐ฐ๐ฐฝ๐ฐข๐ฐ๐ฐฃ๐ฐ๐ฐ๐ฐ๐ฐ ๐ฑ๐ฐ๐ฐผ๐ฐ๐ฐ๐ฐ ๐ฐ๐ฐ๐ฐค๐ฑ ๐ฐด๐ฐ๐ฑ๐ฐฝ๐ฐ'๐ฐฆ๐ฐ ๐ฐผ๐ฐ๐ฐด๐ฐ๐ฐบ ๐ฐด๐ฐ๐ฑ๐ฐ๐ฐ๐ฐข
๐ฐ๐ฐ ๐ฐ๐ฐ๐ฐ 18. ๐ฐ๐ฐ๐ฐ ๐ฐ๐ฐ๐ฐ๐ฐ๐ฐค๐ฐ ๐ฐ๐ฐค๐ฐฒ๐ฐ ๐ฐ๐ฐ๐ฐฝ๐ฐ๐ฐ๐ฐบ๐ฐบ๐ฐฝ๐ฐ ๐ฐ๐ฐฝ๐ฐข๐ฐ๐ฐฃ๐ฐ๐ฐ๐ฐ๐ฐ ๐ฑ๐ฐ๐ฐผ๐ฐ๐ฐ๐ฐ ๐ฐ๐ฐ๐ฐค๐ฑ ๐ฐด๐ฐ๐ฑ๐ฐฝ๐ฐ, 1.418 ๐ฐฝ๐ฐฏ๐ฐ๐ฐบ๐ฐฒ๐ฐ๐ฐฃ๐ฐฃ ๐ฐด๐ฐ๐ฑ๐ฐ๐ฐ๐ฐข๐ฐ๐ฐ๐ฐ ๐ฐ๐ฐ๐ฐผ๐ฐฒ๐ฐ๐ฐ๐ฐ ๐ฐ๐ฑ๐ฐฒ๐ฐ.