The height of a trapezoid is 4 cm, and the upper and lower bases are increased by 6 cm. How many square centimeters is the area increased?
一个梯形的高4厘米，上底和下底都增加6厘米，面积增加多少平方厘米
<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<result>24</result>