The cross section of a canal is trapezoidal, the width of the mouth is 1.6 meters, the width of the bottom is 1.2 meters, and the depth is 0.8 meters. What is the area of the cross section of this canal?
一条水渠的横截面是梯形，渠口宽1.6米，渠底宽1.2米，渠深0.8米，这条水渠横截面的面积是多少．
<gadget id="calculator">1.6 + 1.2</gadget>
<output>2.8</output>

<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">2.8 * 0.4</gadget>
<output>1.12</output>

<result>1.12</result>