The circumference of the bottom of the cylindrical iron bucket is about 62.8cm, and the height is 50cm. How many cm of iron sheet is needed to make this bucket**2.
圆柱形铁皮水桶底面周长约62.8cm，高50cm，做这个水桶至少需要铁皮多少cm**2．
<gadget id="calculator">62.8 * 50</gadget>
<output>3_140</output>

<gadget id="calculator">62.8 / 3.14 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100</gadget>
<output>314</output>

<gadget id="calculator">3_140 + 314</gadget>
<output>3_454</output>

<result>3_454</result>