A cylindrical iron bucket without a lid has a base diameter of 30 cm and a height of 50 cm. How many square decimeters of iron sheet should be used to make such a bucket?
一个无盖的圆柱铁皮水桶，底面直径是30厘米，高是50厘米．做这样一个水桶，至少要用多少平方分米铁皮？
<gadget id="calculator">3.14 * 30 * 50</gadget>
<output>4_710</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">15 ** 2</gadget>
<output>225</output>

<gadget id="calculator">3.14 * 225</gadget>
<output>706.5</output>

<gadget id="calculator">4_710 + 706.5</gadget>
<output>5_416.5</output>

<gadget id="calculator">5_416.5 / 100</gadget>
<output>54.165</output>

<result>54.165</result>