Make a cylindrical chimney with 10 sections of tin, each section is 1 meter long, and the diameter of the chimney is 10 cm, how many square meters of tin is needed at least?
用白铁皮制作圆柱体烟囱10节，每节长1米，烟囱的直径是10厘米，至少需要白铁皮多少平方米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3.14 * (1/10) * 1 * 10</gadget>
<output>3.14</output>

<result>3.14</result>