A cylindrical iron bucket without a lid, with a bottom diameter of 4 decimeters and a height of 6 decimeters. How many square decimeters of iron sheet is used to make such a bucket?
一种没有盖的圆柱形铁皮水桶，底面直径4分米、高6分米．做一个这样的水桶大约用铁皮多少平方分米？
<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>

<result>87.92</result>