cylindrical tin bucket without a cover, the circumference of the bottom is 12.56dm, the height is 5dm, how much dm**2 is used to make this bucket.
一个无盖的圆柱形铁皮水桶，底面周长是12.56dm，高是5dm，做这个水桶要用多少dm**2．
<gadget id="calculator">12.56 * 5</gadget>
<output>62.8</output>

<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4</gadget>
<output>12.56</output>

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

<result>75.36</result>