A trapezoid has an upper base of 7 meters, a lower base of 5 meters, and a height of 6 meters. What is the area of the trapezoid in m**2.
一个梯形，上底是7米，下底是5米，高是6米，这个梯形的面积是多少m**2．
<gadget id="calculator">7 + 5</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>