A trapezoidal melon field, the upper base is 16 meters, the lower base is 43 meters, and the height is half of the upper base. What is the area of this melon field?
一块梯形瓜地，上底16米，下底43米，高是上底的一半．这块瓜地面积是多少？
<gadget id="calculator">16 + 43</gadget>
<output>59</output>

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

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">59 * 4</gadget>
<output>236</output>

<result>236</result>