The length of a rectangular iron plate is 30 decimeters, and the width is long (2/3). Cut a largest circle on this iron plate. What is the area of this circle in square decimeters?
一个长方形铁板长30分米，宽是长的(2/3)，在这块铁板上截一个最大的圆，这个圆的面积是多少平方分米．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">30 * (2/3)</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>