The sum of the upper and lower bases of an isosceles trapezoid is 35 cm, and the waist length is 10 cm. What is the perimeter of the trapezoid in cm?
一个等腰梯形上底和下底之和为35厘米，腰长为10厘米，这个梯形的周长是多少厘米？
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">35 + 20</gadget>
<output>55</output>

<result>55</result>