The cross-section of a sewer is trapezoidal. The width of the sewer mouth is 4.6 meters, the bottom width is 2.2 meters, and the depth is 1.6 meters. How many square meters is its cross-sectional area?
一条下水道德横截面是梯形，下水道口宽是4.6米，底宽是2.2米，深是1.6米，它的横截面面积是多少平方米？
<gadget id="calculator">4.6 + 2.2</gadget>
<output>6.8</output>

<gadget id="calculator">1.6 / 2</gadget>
<output>0.8</output>

<gadget id="calculator">6.8 * 0.8</gadget>
<output>5.44</output>

<result>5.44</result>