cylindrical iron bucket without a lid has a bottom diameter of 6 decimeters and a height of 4.5 decimeters. How many square decimeters of iron sheet are needed to make this bucket?
一个圆柱体的无盖铁皮水桶，底面直径6分米，高是4.5分米，做这个水桶至少需要铁皮多少平方分米？
<gadget id="calculator">3.14 * 6 * 4.5</gadget>
<output>84.78</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">84.78 + 28.26</gadget>
<output>113.04</output>

<result>113.04</result>