Make a cylindrical iron bucket without a cover, the radius of the bottom is 2dm, and the height is 5dm. How much dm**2 is the iron sheet used to make this bucket?
做一个无盖的圆柱形铁皮水桶，底面半径是2dm，高5dm，做这个水桶大约用铁皮多少dm**2？
<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 * 5</gadget>
<output>62.8</output>

<gadget id="calculator">12.56 + 62.8</gadget>
<output>75.36</output>

<result>75.36</result>