The height of a cylindrical oil drum is 6 decimeters and the diameter of the bottom is 4 decimeters. How many square decimeters of iron sheet is needed to make such an oil drum?
一个圆柱形油桶的高是6分米，底面直径是4分米．做一个这样的油桶至少需要多少平方分米的铁皮？
<gadget id="calculator">3.14 * 4 * 6</gadget>
<output>75.36</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">75.36 + 25.12</gadget>
<output>100.48</output>

<result>100.48</result>