A cylindrical iron bucket (without a cover) is 10dm high and the diameter of the bottom surface is high (3/5). How many square decimeters of iron will be used to make this bucket?
一个圆柱形铁皮水桶(无盖)，高10dm，底面直径是高的(3/5)，做这个水桶大约要用多少平方分米铁皮？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 2</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">10 * (3/10)</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 3 * 2 * 10</gadget>
<output>188.4</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">188.4 + 28.26</gadget>
<output>216.66</output>

<result>216.66</result>