Make 10 cylindrical chimneys with a length of 1 meter and a base radius of 6 cm. At least how many square centimeters of iron sheet is needed.
做10节长1米、底面半径为6厘米的圆柱形烟囱管．至少需要铁皮多少平方厘米．
<gadget id="calculator">3.14 * 2 * 6 * 1 * 100 * 10</gadget>
<output>37_680</output>

<result>37_680</result>