The cross-section of a canal is a trapezoid, the mouth of the canal is 2.2 meters wide, the bottom of the canal is 1.4 meters wide, and the canal is 1.3 meters deep. What is the cross-sectional area?
一条水渠的横截面是一个梯形，渠口宽2.2米，渠底宽1.4米，渠深1.3米，横截面积是多少？
<gadget id="calculator">2.2 + 1.4</gadget>
<output>3.6</output>

<gadget id="calculator">1.3 / 2</gadget>
<output>0.65</output>

<gadget id="calculator">3.6 * 0.65</gadget>
<output>2.34</output>

<result>2.34</result>