A cylindrical bucket (without a cover) has a bottom circumference of 125.6 cm and a height of 50 cm. How many square decimeters of iron sheets are used to make a pair of such buckets?
一个圆柱形水桶(无盖)底面周长125.6cm，高50cm，做一对这样的水桶要用多少平方分米铁皮？
<gadget id="calculator">125.6 * 50</gadget>
<output>6_280</output>

<gadget id="calculator">125.6 / 3.14 / 2</gadget>
<output>20</output>

<gadget id="calculator">20 ** 2</gadget>
<output>400</output>

<gadget id="calculator">3.14 * 400</gadget>
<output>1_256</output>

<gadget id="calculator">6_280 + 1_256</gadget>
<output>7_536</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">7_536 * (1/50)</gadget>
<output>3_768/25 = around 150.72</output>

<result>3_768/25 = around 150.72</result>