A right-angled trapezoid has an upper base of 4 cm and a lower base of 4.8 cm. If the upper base is extended to 6 cm, the area will increase by 6 cm2. What is the area of the original trapezoid in cm2?
一个直角梯形，上底是4厘米，下底是4.8厘米，若将上底延长至6厘米，面积则增加6平方厘米，原来梯形的面积是多少平方厘米？
<gadget id="calculator">4 + 4.8</gadget>
<output>8.8</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 / 2 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8.8 * 6 * (1/2)</gadget>
<output>26.4</output>

<result>26.4</result>