With winter approaching, Zhuo Ren made a chimney for his parents with six cylindrical chimney pipes with a length of 1 meter and a radius of 10 cm at the bottom. How many square meters of iron sheet is needed at least?
寒冬将至，卓仁为父母用6节长1米、底面半径为10厘米的圆柱形烟囱管做了一个烟囱，至少需要铁皮多少平方米？
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">2 * 3.14 * (1/10) * 1 * 6</gadget>
<output>3.768</output>

<result>3.768</result>