A village primary school needs 30 iron furnace tubes with a base diameter of 16 cm and a length of 2 meters. Please calculate how many square centimeters of iron sheets are needed to make these furnaces?
某村小学需30个底面直径16厘米，长2米的铁皮炉筒，请你计算一下制做这些炉大约需要铁皮多少平方厘米？
<gadget id="calculator">30 / 10</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 16 * 2 * 100 * 3</gadget>
<output>30_144</output>

<result>30_144</result>