The upper base of a trapezoid is 24 cm, the lower base is 16 cm, and the height is 1 decimeter. What is the area in cm**2.
一个梯形的上底是24厘米，下底是16厘米，高是1分米，面积是多少cm**2．
<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>