To make a cylindrical iron bucket with a bottom diameter of 4dm and a height of 6dm, how many square meters of iron sheet is needed at least?
做一个底面直径4dm，高6dm的圆柱形铁皮水桶，至少需要铁皮多少平方米？
<gadget id="calculator">3.14 * 4 * 6</gadget>
<output>75.36</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">75.36 + 12.56</gadget>
<output>87.92</output>

<gadget id="calculator">87.92 / 100</gadget>
<output>0.8792</output>

<result>0.8792</result>