Two identical trapezoids are put together to form a parallelogram. The base of this parallelogram is 10 cm and the height is 5 cm. What is the area of one of the trapezoids in square centimeters?
两个完全相同的梯形拼成一个平行四边形，这个平行四边形的底是10厘米，高是5厘米，其中一个梯形的面积是多少平方厘米．
<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<result>25</result>