\[(16;4):\ \ \ \ \ \ \]
\[\ 4 = \sqrt{16}\]
\[4 = 4\]
\[\Longrightarrow \ \ \ \ \ да.\]
\[B(100;\ \ 10):\ \ \ \ \ \]
\[10 = \sqrt{100}\]
\[10 = 10\]
\[\Longrightarrow \ \ \ \ \ да.\]
\[O(0;0):\ \ \ \ \ \ \ \ \]
\[\ 0 = \sqrt{0}\ \]
\[0 = 0\]
\(\Longrightarrow \ \ \ \ да.\)
\[M(3;9):\ \ \ \ \ \ \]
\[9 = \sqrt{3}\ \]
\[\Longrightarrow \ \ \ нет.\]
\[K( - 36;\ \ 6):\ \ \ \ \ \]
\[6 = \sqrt{- 36}\]
\[\Longrightarrow \ \ \ \ \ нет.\]