How many square centimeters of iron sheet should be used for an uncovered cylindrical iron bucket with a height of 30 cm and a bottom radius of 10 cm?
一个高30厘米、底面半径10厘米的无盖圆柱形铁皮水桶，要用多少平方厘米的铁皮？
<gadget id="calculator">2 * 3.14 * 10 * 30</gadget>
<output>1_884</output>

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

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

<gadget id="calculator">1_884 + 314</gadget>
<output>2_198</output>

<result>2_198</result>