To make a cylindrical tin bucket without a cover, the diameter of the bottom surface is 8 decimeters, and the height is 2.5 decimeters. How many square meters of iron sheet should be used to make this bucket?
做一个无盖的圆柱形铁皮水桶，底面直径8分米，高2.5分米，做这个水桶至少要用铁皮多少平方米？
<gadget id="calculator">3.14 * 8 * 2.5</gadget>
<output>62.8</output>

<gadget id="calculator">8 / 2</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">62.8 + 50.24</gadget>
<output>113.04</output>

<gadget id="calculator">113.04 / 100</gadget>
<output>1.1304</output>

<result>1.1304</result>