The radius of the automatic rotating sprinkler irrigation device on the lawn is 10 meters, what is the maximum spraying area in square meters?
草坪上自动旋转喷灌装置半径是10米，它的最大喷射面积是多少平方米．
<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<result>314</result>