The range of an automatic rotary sprinkler irrigation device on the grass in the park is 12m, what is the area it can irrigate?
公园草地上一个自动旋转喷灌装置的射程是12m，它能喷灌的面积是多少．
<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

<gadget id="calculator">3.14 * 144</gadget>
<output>452.16</output>

<result>452.16</result>