A self-rotating sprinkler device, its sprinkler surface is a circle with a diameter of 12 meters, how many square meters is the sprinkler area of this device?
一种自动旋转的喷水装置，它的喷灌面是一个直径为12米的圆，这种装置的喷灌面积是多少平方米．
<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 ** 2</gadget>
<output>36</output>

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

<result>113.04</result>