The upper base of a trapezoid is 25cm, the lower base is 16cm, and the height is 2dm. What is the area?
一个梯形的上底是25cm，下底16cm，高2dm，面积是多少．
<gadget id="calculator">25 + 16</gadget>
<output>41</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">41 * 10</gadget>
<output>410</output>

<result>410</result>