It is known that the height of the trapezoid is 1.8, the upper base is 2, and the lower base is 3.5. If the largest parallelogram is cut off, what is the remaining area?
已知梯形高是1.8，上底是2，下底是3.5，剪去一个最大的平行四边形，剩下的面积是多少？
<gadget id="calculator">3.5 - 2</gadget>
<output>1.5</output>

<gadget id="calculator">1.8 / 2</gadget>
<output>0.9</output>

<gadget id="calculator">1.5 * 0.9</gadget>
<output>1.35</output>

<result>1.35</result>