To make a 20-section chimney with a bottom circumference of 37.68 centimeters and a length of 1.2 meters, how many square meters of tin is needed at least?
做20节底面周长37.68厘米、长1.2米的烟囱，至少需要多少平方米白铁皮？
<gadget id="calculator">37.68 / 100</gadget>
<output>0.3768</output>

<gadget id="calculator">0.3768 * 1.2 * 20</gadget>
<output>9.0432</output>

<result>9.0432</result>