\[Рисунок\ в\ учебнике.\]
\[1)\ \angle ABC:\]
\[\angle ABC = 1;\]
\[\angle MKE = 2\angle ABC = 2;\]
\[\angle STK = 5\angle ABC = 5.\]
\[2)\ \angle MKE:\]
\[\angle MKE = 2\angle ABC = 1;\]
\[\angle ABC = \frac{1}{2}\angle MKE = 0,5;\]
\[\angle STK = 5\angle ABC = 2,5.\]