The cross-section of the embankment is a trapezoid, the upper base is 2.6 meters, 8 decimeters less than the lower base, and the height is 1.8 meters. What is the cross-sectional area of this embankment in square meters?
堤坝的横截面是一个梯形，上底是2.6米，比下底少8分米，高是1.8米，这座堤坝横截面的面积是多少平方米？
<gadget id="calculator">2.6 + 0.8</gadget>
<output>3.4</output>

<gadget id="calculator">2.6 + 3.4</gadget>
<output>6</output>

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

<gadget id="calculator">6 * 0.9</gadget>
<output>5.4</output>

<result>5.4</result>