The upper base of a trapezoid is 6 cm, the lower base is 8.2 cm, and the height is 4.5 cm. If the largest triangle is cut from this trapezoid, what is the area of the remaining part?
一个梯形的上底是6cm，下底是8.2cm，高是4.5cm．如果在这个梯形中剪去一个最大是的三角形，剩下部分的面积是多少平方厘米？
<gadget id="calculator">6 + 8.2</gadget>
<output>14.2</output>

<gadget id="calculator">4.5 / 2</gadget>
<output>2.25</output>

<gadget id="calculator">14.2 * 2.25</gadget>
<output>31.95</output>

<gadget id="calculator">8.2 * 2.25</gadget>
<output>18.45</output>

<gadget id="calculator">31.95 - 18.45</gadget>
<output>13.5</output>

<result>13.5</result>