§ Задание 215
\[\boxed{\text{4.\ 215}}\]
\[\textbf{а)}\ MN = a\]
\[\textbf{б)}\ MN = 2a\]
\[\textbf{в)}\ MN = a\]
\[\textbf{г)}\ MN = 4a\]
\[\boxed{\text{4.\ 215}}\]
\[\textbf{а)}\ MN = a\]
\[\textbf{б)}\ MN = 2a\]
\[\textbf{в)}\ MN = a\]
\[\textbf{г)}\ MN = 4a\]