An automatic sprinkler irrigation device, the radius of the spraying range is 8 meters, how many square decimeters is the area of the spraying range?
一个自动喷水灌装置，喷洒范围的半径是8米，喷洒范围的面积是多少平方分米？
<gadget id="calculator">8 ** 2</gadget>
<output>64</output>

<gadget id="calculator">3.14 * 64 * 100</gadget>
<output>20_096</output>

<result>20_096</result>