The area of the parallelogram formed by two identical trapezoids is 80 square centimeters, what is the area of one of the trapezoids in square centimeters?
两个完全一样的梯形拼成的平行四边形的面积是80平方厘米，其中一个梯形的面积是多少平方厘米．
<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<result>40</result>