The upper base of an isosceles trapezoid is 10 cm, the lower base is 8 cm, and the length of a waist is 6 cm. How many centimeters of iron wire is required to enclose this isosceles trapezoid?
一个等腰梯形的上底是10厘米，下底是8厘米，一条腰长6厘米，围成这个等腰梯形至少要多少厘米长的铁丝．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 + 10 + 8</gadget>
<output>30</output>

<result>30</result>