The length of an isosceles trapezoid is 6 cm, the length of the upper base is 2 cm, and the length of the lower base is 4 times the length of the upper base. How many centimeters of iron wire are required to enclose this trapezoid?
一个等腰梯形腰长6厘米，上底长2厘米，下底长是上底长的4倍，围成这个梯形至少要多少厘米铁丝．
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">2 + 8 + 12</gadget>
<output>22</output>

<result>22</result>