A cylindrical bucket without a lid is 20 cm high and has a base circumference of 62.8 cm. What is the minimum square centimeter of iron sheet needed to make this bucket?
一个没有盖的圆柱形水桶，高20厘米，底面周长是62.8厘米．做这个水桶至少需要用铁皮多少平方厘米？
<gadget id="calculator">62.8 * 20</gadget>
<output>1_256</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">1_256 + 314</gadget>
<output>1_570</output>

<result>1_570</result>