A cylindrical tin bucket without a lid has a bottom circumference of 25.12 decimeters and a height of 12 decimeters. How many square decimeters of iron sheets are needed to make such a pair of buckets?
一个没有盖的圆柱形铁皮水桶，底面周长25.12分米，高12分米．做这样一对水桶要用铁皮多少平方分米？
<gadget id="calculator">25.12 / 2 / 3.14</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16</gadget>
<output>50.24</output>

<gadget id="calculator">25.12 * 12</gadget>
<output>301.44</output>

<gadget id="calculator">50.24 + 301.44</gadget>
<output>351.68</output>

<gadget id="calculator">351.68 * 2</gadget>
<output>703.36</output>

<result>703.36</result>