The upper base of a trapezoid is 4m, the lower base is 8m, and the height is 6m. What is the area in m**2?
一个梯形上底4m，下底8m，高6m，面积是多少m**2．
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

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

<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<result>36</result>