Two identical trapezoids are put together to form a parallelogram. The base of the parallelogram is 16 cm. The lower base of the trapezoid is 10 cm. What is the upper base of the trapezoid in cm?
两个完全相同的梯形拼成一个平行四边形，这个平行四边形的底是16厘米，梯形的下底是10厘米，梯形的上底是多少厘米．
<gadget id="calculator">16 - 10</gadget>
<output>6</output>

<result>6</result>