The circumference is 9.42 meters (π takes 3.14), find the area of the circle.
周长9.42米(π取3.14)，求圆的面积．
<gadget id="calculator">9.42 / 3.14 / 2</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>