There is an automatic rotating sprinkler irrigation device in the middle of the lawn of the square. Its range is 16 meters. How many square meters can it spray and irrigate?
在广场的草坪中间有一种自动旋转的喷灌装置，它的射程是16米，它能喷灌的面积是多少平方米？
<gadget id="calculator">16 ** 2</gadget>
<output>256</output>

<gadget id="calculator">3.14 * 256</gadget>
<output>803.84</output>

<result>803.84</result>