A section of ventilation pipe has a bottom circumference of 8 decimeters and a height of 3 meters. How many square meters of iron sheets are needed to make 10 sections of such ventilation pipes?
一节通风管，底面周长为8分米，高3米，做10节这样的通风管至少需要多少平方米的铁皮．
<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 3 * 10</gadget>
<output>24</output>

<result>24</result>