A trapezoid whose lower base is shortened by 3 centimeters reduces its area by 6 square centimeters and becomes a square. What is the area of the original trapezoid?
一个梯形，它的下底缩短3厘米，面积就减少6平方厘米，且变成了一个正方形．原来梯形的面积是多少？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">6 * (2/3)</gadget>
<output>4</output>

<gadget id="calculator">4 + 3 + 4</gadget>
<output>11</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">11 * 2</gadget>
<output>22</output>

<result>22</result>