\[\boxed{\ \mathbf{128\ (128)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[M(10);\ \ P(70);\ \ N(80);\ \ T(130);\ \ \]
\[S(155);\ \ K(180).\]
\[\boxed{\ \mathbf{128}.\ }\]
\[OK = OC - 2BD = 6 - 2 \cdot 2,5 =\]
\[= 6 - 5 = 1\ см.\]
\[Ответ\ 1\ см.\]