How many square centimeters of iron sheets are needed to make a cylindrical ventilation pipe with a bottom diameter of 10 cm and a length of 60 cm?
制作一个底面直径是10厘米，长是60厘米的圆柱体通风管，至少需要铁皮多少平方厘米？
<gadget id="calculator">3.14 * 10 * 60</gadget>
<output>1_884</output>

<result>1_884</result>