The upper base of an isosceles trapezoid is 8 cm, the lower base is 10 cm, and the length of one waist is 7 cm. How many centimeters of iron wire is required to enclose this isosceles trapezoid?
一个等腰梯形的上底是8厘米，下底是10厘米，一条腰长7厘米，围成这个等腰梯形至少要多少厘米的铁丝．
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">8 + 10 + 14</gadget>
<output>32</output>

<result>32</result>