The height of a cylindrical bucket without a lid is 5 decimeters, and the circumference of the bottom surface is 12.56 decimeters. How many iron sheets are needed to make a pair of buckets?
一种圆柱形无盖水桶的高是5分米，底面周长是12.56分米，做一对水桶至少要多少铁皮？
<gadget id="calculator">12.56 * 5</gadget>
<output>62.8</output>

<gadget id="calculator">12.56 / 3.14 / 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">62.8 + 12.56</gadget>
<output>75.36</output>

<gadget id="calculator">75.36 * 2</gadget>
<output>150.72</output>

<result>150.72</result>