The area of a trapezoid is 84 square meters, the upper base is 6 meters, and the lower base is 8 meters. What is its height in meters?
一个梯形面积是84平方米，上底是6米，下底是8米，它的高是多少米．
<gadget id="calculator">6 + 8</gadget>
<output>14</output>

<gadget id="calculator">2 / 14</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">84 * (1/7)</gadget>
<output>12</output>

<result>12</result>