Use a wall to enclose a trapezoidal vegetable field with a height of 16 meters and a total length of 60 meters. What is the area of this vegetable field in square meters?
利用一面墙，用篱笆围出一块梯形的菜地，高16米，篱笆全长60米，这块菜地的面积是多少平方米？
<gadget id="calculator">60 - 16</gadget>
<output>44</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">44 * 8</gadget>
<output>352</output>

<result>352</result>