The lower base of a trapezoid is three times the upper base, and the upper base is extended by 8 cm to form a parallelogram with an area of 288 cm2. What is the area of the original trapezoid in square centimeters?
一个梯形的下底是上底的3倍，把上底延长8厘米，组成一个面积是288平方厘米的平行四边形．原来梯形的面积是多少平方厘米？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">4 + 12</gadget>
<output>16</output>

<gadget id="calculator">288 / 12 / 2</gadget>
<output>12</output>

<gadget id="calculator">16 * 12</gadget>
<output>192</output>

<result>192</result>