A fan-shaped flower bed has a central angle of 240° and a radius of 3 meters. What is the perimeter of the flower bed in meters?
一个扇形花坛的圆心角为240°，半径为3米，这个花坛的周长是多少米．
<gadget id="calculator">240 * 3.14 * 3</gadget>
<output>2_260.8</output>

<gadget id="calculator">2_260.8 / 180</gadget>
<output>12.56</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">12.56 + 6</gadget>
<output>18.56</output>

<result>18.56</result>