The factory needs to produce 1000 cylindrical tin buckets without lids, with a bottom diameter of 6 decimeters and a height of 7 decimeters. At least how many square meters of iron sheet should be used?
工厂要生产1000个无盖的圆柱形铁皮水桶，底面直径为6分米，高7分米．至少要用铁皮多少平方米？
<gadget id="calculator">3.14 * 6 * 7</gadget>
<output>131.88</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">131.88 + 28.26</gadget>
<output>160.14</output>

<gadget id="calculator">1 * 100</gadget>
<output>100</output>

<gadget id="calculator">1_000 / 100</gadget>
<output>10</output>

<gadget id="calculator">160.14 * 10</gadget>
<output>1_601.4</output>

<result>1_601.4</result>