\[Стр.\ 92.\]
\[51.\ Измерение\ углов.\ Транспортир\]
\[\boxed{\mathbf{1.}}\]
\[\textbf{а)}\ \frac{1}{180}\]
\[\textbf{б)}\ 180;90\]
\[\textbf{в)}\ острым\]
\[\textbf{г)}\ тупым.\]
\[\boxed{\mathbf{2.}}\]
\[\angle BAC = 50{^\circ};\ \ \ \]
\[\ \angle FOK = 50{^\circ};\ \ \ \ \]
\[\angle PLT = 90{^\circ};\ \ \ \]
\[\angle MKP = 30{^\circ}.\]
\[\boxed{\mathbf{3.}}\]
\[\boxed{\mathbf{4.}}\]
\[\angle AOC = 120{^\circ}\]
\[\angle AOM = 60{^\circ}\]
\[\angle COM = 60{^\circ}\]