The height of a trapezoid is 5 cm, and the upper and lower bases are increased by 8 cm. How many square centimeters is the area increased?
一个梯形的高是5厘米，上底和下底都增加8厘米，面积增加多少平方厘米
<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>