A cylindrical iron bucket with no lid on it is 8 decimeters in height and 2 decimeters in radius at the bottom. About how many square decimeters of iron sheets are used to make this bucket?
一个圆柱形铁皮水桶，上面没有盖，高是8分米，底面半径是2分米．做这个水桶大约要用铁皮多少平方分米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

<gadget id="calculator">3.14 * 2 * 2 * 8</gadget>
<output>100.48</output>

<gadget id="calculator">12.56 + 100.48</gadget>
<output>113.04</output>

<result>113.04</result>