What is the area of a circular lawn with a circumference of 9.42 meters in square meters?
一个周长是9.42米的圆形草地，面积是多少平方米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">9.42 / 6.28</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

<result>7.065</result>