A wooden stick with a length of 1.5m is used to rotate horizontally around one end for one circle. How large is the area swept by the stick?
用一根长1.5m的木棍，绕一端水平旋转一周，木棍扫过的面积有多大？
<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>