The upper base of a trapezoid is 10 meters, the lower base is 4 meters, and the height is half of the upper base. What is the area of the trapezoid in square meters?
一个梯形的上底是10米，下底是4米，高是上底的一半，这个梯形的面积是多少平方米．
<gadget id="calculator">10 + 4</gadget>
<output>14</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">14 * (5/2)</gadget>
<output>35</output>

<result>35</result>