The upper base of a trapezoid is 2 meters, the lower base is 4 meters, and the height is (1/2) longer than the lower base. What is the area of the trapezoid in square meters?
一个梯形的上底是2米，下底是4米，高比下底长(1/2)，这个梯形的面积是多少平方米？
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

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

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

<gadget id="calculator">4 * (3/2)</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<result>18</result>