A right-angled trapezoid, if the upper base remains the same, but the lower base is reduced by 4 cm, it becomes a square with a side length of 6 cm. What is the area of the original trapezoid in cm**2.
一个直角梯形，如果上底不变，下底减少4cm就变成边长6cm的正方形，原梯形的面积是多少cm**2．
<gadget id="calculator">6 + 4 + 6</gadget>
<output>16</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">16 * 3</gadget>
<output>48</output>

<result>48</result>