To make a cuboid frame with a base area of 9 square centimeters and a height of 4 centimeters, at least how many centimeters of iron wire is needed.
做一个底面积是9平方厘米的正方形，高是4厘米的长方体框架，至少需要多少厘米长的铁丝．
<gadget id="calculator">3 + 3 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>