A right-angled trapezoid, its upper base is 22cm, if the lower base is reduced by 3cm, it becomes a square, find the area of this right-angled trapezoid.
一个直角梯形，它的上底是22cm，如果下底减少3cm就变成了正方形，求这个直角梯形的面积．
<gadget id="calculator">22 + 3 + 22</gadget>
<output>47</output>

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

<gadget id="calculator">47 * 11</gadget>
<output>517</output>

<result>517</result>