A canal is trapezoidal in cross section, with a width of 3.2 meters at the mouth, a width of 1.4 meters at the bottom, and a depth of 0.7 meters. What is the cross-sectional area of this canal in square meters?
一条水渠横截面是梯形，渠口宽3.2米，渠底宽1.4米，渠深0.7米．这条水渠的横截面积是多少平方米？
<gadget id="calculator">3.2 + 1.4</gadget>
<output>4.6</output>

<gadget id="calculator">0.7 / 2</gadget>
<output>0.35</output>

<gadget id="calculator">4.6 * 0.35</gadget>
<output>1.61</output>

<result>1.61</result>