The upper base of an isosceles trapezoid is 8 meters long, the lower base is 12 meters long, and the side is 11 meters long. What is the perimeter of the trapezoid?
一个等腰梯形上底长8米，下底长12米，一条腰长11米，这个梯形的周长是多少米？
<gadget id="calculator">11 + 11 + 8 + 12</gadget>
<output>42</output>

<result>42</result>