A cylindrical iron bucket without a cover has a bottom circumference of 12.56 decimeters and a height of 4 decimeters. If the inner and outer surfaces of this bucket are painted, how many square decimeters is the painted area?
一只无盖的圆柱形铁皮水桶，它的底面周长12.56分米，高4分米，把这只水桶的内外表面刷上漆，刷漆的面积是多少平方分米？
<gadget id="calculator">12.56 * 5</gadget>
<output>62.8</output>

<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">12.56 / 6.28</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>