The cylindrical (without cover) tin bucket used in the classroom is 30cm high and the radius of the bottom surface is high (1/3). How much tin should be used to make such a bucket?
教室里用的圆柱形(无盖)铁皮水桶，高是30cm，底面半径是高的(1/3)，做一个这样的水桶至少要用多少铁皮？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 * (1/3)</gadget>
<output>10</output>

<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>