To make a cylindrical tin bucket without a cover, the height is 6 decimeters, and the radius of the bottom surface is 4 decimeters. How many square decimeters of iron sheet are needed to make this bucket?
做一个无盖的圆柱形铁皮水桶，高是6分米，底面半径是4分米，做这个桶至少需要铁皮多少平方分米？
<gadget id="calculator">2 * 3.14 * 4 * 6</gadget>
<output>150.72</output>

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

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

<gadget id="calculator">150.72 + 50.24</gadget>
<output>200.96</output>

<result>200.96</result>