The upper base of a trapezoid is 24cm, the lower base is 16cm, and the height is 1dm. What is the area?
一个梯形的上底是24cm，下底16cm，高1dm，面积是多少．
<gadget id="calculator">24 + 16</gadget>
<output>40</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">40 * 1 * 5</gadget>
<output>200</output>

<result>200</result>