A cylindrical tin bucket without a lid has a bottom circumference of 18.84dm and a height of 5dm. How many square decimeters of iron sheet is needed to make this bucket?
一个无盖的圆柱形铁皮水桶，底面周长是18.84dm，高是5dm．做这个水桶至少要多少平方分米的铁皮？
<gadget id="calculator">18.84 * 5</gadget>
<output>94.2</output>

<gadget id="calculator">18.84 / 3.14 / 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">94.2 + 28.26</gadget>
<output>122.46</output>

<result>122.46</result>