\[\boxed{\mathbf{334.}ОК\ ГДЗ\ –\ домашка\ на\ 5}\]
\[Дано:\]
\[\angle AOB = 60{^\circ};\]
\[d = 2\ см.\]
\[Найти:\]
\[\text{S.}\]
\[Решение.\]
\[\frac{\text{BK}}{\text{OK}} = \frac{\text{BK}}{2} = tg30{^\circ} = \frac{1}{\sqrt{3}};\]
\[BK = \frac{2}{\sqrt{3}} = \frac{2\sqrt{3}}{3}.\]
\[AB = 2BK = \frac{4\sqrt{3}}{3}\ см.\]
\[AA_{1}B_{1}B - прямоугольник:\]
\[S = AB \cdot 10\sqrt{3} = \frac{4\sqrt{3}}{3} \cdot 10\sqrt{3} =\]
\[= 40\ см^{2}.\]
\[Ответ:40\ см^{2}.\]