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

<result>24</result>