Two identical trapezoids are put together to form a parallelogram with an area of 18.2 square centimeters. What is the area of one of the trapezoids in square centimeters?
两个完全一样的梯形，拼成一个面积是18.2平方厘米的平行四边形，其中一个梯形的面积是多少平方厘米．
<gadget id="calculator">18.2 / 2</gadget>
<output>9.1</output>

<result>9.1</result>