cylindrical metal bucket without a cover has a bottom circumference of 9.42 decimeters and a height of 6 decimeters. How many square decimeters of iron sheet are needed to make such a bucket?
一个圆柱形无盖铁皮水桶，底面周长是9.42分米，高6分米，做这样的一个水桶至少需要铁皮多少平方分米？
<gadget id="calculator">9.42 * 6</gadget>
<output>56.52</output>

<gadget id="calculator">9.42 / 3.14 / 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 ** 2</gadget>
<output>2.25</output>

<gadget id="calculator">3.14 * 2.25</gadget>
<output>7.065</output>

<gadget id="calculator">56.52 + 7.065</gadget>
<output>63.585</output>

<result>63.585</result>