A cylindrical bucket without a lid has a base diameter of 6 decimeters and a height of 5 decimeters. How many square decimeters of iron sheet are needed to make such a bucket.
一个无盖的圆柱体水桶，底面直径6分米，高5分米．制作这样一个水桶需要多少平方分米的铁皮．
<gadget id="calculator">3.14 * 6 * 5</gadget>
<output>94.2</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">94.2 + 28.26</gadget>
<output>122.46</output>

<result>122.46</result>