The diameter of the cylindrical chimney is 8 decimeters, and each section is 1.5 meters long. To make such a chimney, at least how many decimeters**2 iron sheets are needed.
圆柱形烟囱的直径为8分米，每节长1.5米，做一节这样的烟囱至少要多少分米**2铁皮．
<gadget id="calculator">1.5 * 10</gadget>
<output>15</output>

<gadget id="calculator">3.14 * 8 * 15</gadget>
<output>376.8</output>

<result>376.8</result>