There is an automatic rotary sprinkler on the grass in the park. Its range is 12 meters. How many square meters of grass can it sprinkle on?
公园草地上有一个自动旋转洒水器，它的射程是12米，能洒到的草地面积是多少平方米？
<gadget id="calculator">12 ** 2</gadget>
<output>144</output>

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

<result>452.16</result>