Two identical trapezoids form a parallelogram with an area of 20 square centimeters. What is the area of each trapezoid in square centimeters?
两个完全一样的梯形拼成了一个面积是20平方厘米的平行四边形，每个梯形的面积是多少平方厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<result>10</result>