The cross section of a canal is trapezoidal, the mouth of the canal is 1.8 meters wide, the canal is 0.8 meters deep, and the bottom of the canal is 1.2 meters wide. What is the area in square meters?
一条水渠横截面是梯形，渠口宽1.8米，渠深0.8米，渠底宽1.2米，面积是多少平方米．
<gadget id="calculator">1.2 + 1.8</gadget>
<output>3</output>

<gadget id="calculator">0.8 / 2</gadget>
<output>0.4</output>

<gadget id="calculator">3 * 0.4</gadget>
<output>1.2</output>

<result>1.2</result>