Two identical trapezoids form a parallelogram. It is known that the area of a trapezoid is 40 square centimeters, the upper and lower bases are 5 cm and 3 cm respectively. What is the height of the assembled parallelogram in centimeters?
两个完全相同的梯形拼成一个平行四边形．已知一个梯形的面积是40平方厘米，上、下底分别是5厘米和3厘米．拼成的平行四边形的高是多少厘米．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<result>10</result>