The upper base of an isosceles trapezoid is 4 cm, the lower base is 6 cm, and one waist is 5 cm. How many centimeters of iron wire are needed to enclose this isosceles trapezoid?
一个等腰梯形的上底是4厘米，下底是6厘米，一条腰是5厘米，围成这个等腰梯形需要多少厘米长的铁丝．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">4 + 6 + 10</gadget>
<output>20</output>

<result>20</result>