A section of iron chimney is 1.6 meters long and 0.2 meters in diameter. To make such a chimney with 5 sections, how many square meters of iron sheet should be used at least?
一节铁皮烟筒长1.6米，直径是0.2米，做这样的烟筒5节，至少要用铁皮多少平方米？
<gadget id="calculator">3.14 * 0.2 * 1.6 * 5</gadget>
<output>5.024</output>

<result>5.024</result>