The cross-section of a canal is trapezoidal, the width of the canal mouth is 1.6m, the width of the canal bottom is 1.5m, and the depth of the canal is 1.2m. What is the cross-sectional area?
一条水渠的横截面是梯形，渠口宽是1.6m，渠底宽是1.5m，水渠深1.2m，横截面面积是多少．
<gadget id="calculator">1.6 + 1.5</gadget>
<output>3.1</output>

<gadget id="calculator">1.2 / 2</gadget>
<output>0.6</output>

<gadget id="calculator">3.1 * 0.6</gadget>
<output>1.86</output>

<result>1.86</result>