The base of a parallelogram is 10 decimeters, and its corresponding height is 7 decimeters. If it is cut into two identical trapezoids, what is the area of one trapezoid in decimeters**2.
一张平行四边形的纸底是10分米，它对应的高是7分米，若把它剪成两个完全一样的梯形，其中一个梯形的面积是多少分米**2．
<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">10 * (7/2)</gadget>
<output>35</output>

<result>35</result>