A self-rotating sprinkler has a range of 6 meters. How much area can it sprinkle on the grass in one rotation?
一种自动旋转的洒水器的射程是6米，它旋转一周可以洒到草地的面积有多大？
<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

<gadget id="calculator">3.14 * 36</gadget>
<output>113.04</output>

<result>113.04</result>