The diameter of the bottom of a cylindrical bucket is 30 cm, and the height is 1.5 times the diameter of the bottom. How many square meters of iron sheet is needed to make such a bucket?
一个圆柱形水桶底面直径是30厘米，高是底面直径的1.5倍，做这样一个水桶至少需要多少平方米的铁皮．
<gadget id="calculator">3.14 * 30 * 30 * 1.5</gadget>
<output>4_239</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_239 + 706.5</gadget>
<output>4_945.5</output>

<gadget id="calculator">4_945.5 / 10_000</gadget>
<output>0.49455</output>

<result>0.49455</result>