right-angled trapezoid has a lower base of 20 meters. If the upper base is increased by 14 meters, the land becomes a square. What is the area of the original trapezoid in square meters?
一块直角梯形的地，它的下底是20米，如果上底增加14米，这块地就变成了正方形，原梯形的面积是多少平方米．
<gadget id="calculator">20 - 14</gadget>
<output>6</output>

<gadget id="calculator">6 + 20</gadget>
<output>26</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">26 * 10</gadget>
<output>260</output>

<result>260</result>