The cross-section of a canal is a trapezoid, the mouth of the canal is 1.8 meters wide, the bottom of the canal is 1.2 meters wide, and the canal is 1 meter deep. What is the area of the cross-section in square meters?
一条水渠的横截面是一个梯形，渠口宽1.8米，渠底宽1.2米，渠深1米，横截面的面积是多少平方米？
<gadget id="calculator">1.8 + 1.2</gadget>
<output>3</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * (1/2)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>