To make a cuboid frame with a base circumference of 18 cm and a height of 2 cm, how many centimeters of iron wire is needed at least
做一个底面周长为18厘米、高2厘米的长方体框架，至少需铁丝多少厘米
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">36 + 8</gadget>
<output>44</output>

<result>44</result>