To make a cylindrical chimney with a length of 1m and a radius of 6cm, at least how many square centimeters of iron sheet should be used.
做一节长1m，半径是6cm的圆柱形烟囱，至少用多少平方厘米铁皮．
<gadget id="calculator">3.14 * 6 * 2 * 1 * 100</gadget>
<output>3_768</output>

<result>3_768</result>