\[\mathbf{Страница\ 57.}\]
\[\boxed{\mathbf{7.}}\]
\[\textbf{а)}\ \angle ABC;\angle BAC;\angle ACB.\]
\[\textbf{б)}\ \angle AMP;\ \angle MPK;\ \]
\[\angle PKA;\ \angle KAM.\]
\[\textbf{в)}\ \angle CFT;\ \angle\ FTO;\ \angle TOB;\ \]
\[\angle OBC;\ \angle BCF.\]
\[\boxed{\mathbf{8.}}\]
\[S = 5 \cdot 2 = 10\ \left( см^{2} \right).\]
\[P = 2 \cdot (5 + 2) = 2 \cdot 7 = 14\ см.\]
\[\boxed{\mathbf{9.}}\]
\[\textbf{а)}\ 180 - ую.\]
\[\textbf{б)}\ 180{^\circ};90{^\circ}.\]
\[\textbf{в)}\ острым.\]
\[\textbf{г)}\ тупым.\]
\[\boxed{\mathbf{10.}}\]
\[\angle BAC = 45{^\circ};\ \angle FOK = 45{^\circ};\ \]
\[\angle PLT = 90{^\circ};\ \angle MKP = 30{^\circ}.\]