How many square decimeters of iron sheet are needed to make two cylindrical iron sheet buckets with a height of 5 decimeters and a bottom diameter of 2 decimeters?
做两个高5分米、底面直径是2分米的无盖圆柱形铁皮水桶，需要铁皮多少平方分米？
<gadget id="calculator">3.14 * 2 * 5</gadget>
<output>31.4</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1</gadget>
<output>3.14</output>

<gadget id="calculator">31.4 + 3.14</gadget>
<output>34.54</output>

<gadget id="calculator">34.54 * 2</gadget>
<output>69.08</output>

<result>69.08</result>