Make 10 sections of cylindrical ventilation pipes with white iron sheets, each section is 8 decimeters long, and the radius of the bottom circle is 1 decimeter, so how many square decimeters of white iron sheets are needed at least?
用白铁皮制作圆柱形通风管道10节，每节长8分米，底面圆的半径是1分米，这样至少需要白铁皮多少平方分米？
<gadget id="calculator">2 * 3.14 * 1 * 8</gadget>
<output>50.24</output>

<gadget id="calculator">50.24 * 10</gadget>
<output>502.4</output>

<result>502.4</result>