The area of a trapezoidal cabbage field is 21.6 square meters. The sum of its upper and lower bases is 5.4 meters. What is the height in meters?
一块梯形白菜地的面积是21.6平方米，它的上、下底之和是5.4米，高是多少米．
<gadget id="calculator">2 / 5.4</gadget>
<output>0.37037</output>

<gadget id="calculator">21.6 * 0.37037</gadget>
<output>7.999992</output>

<result>7.999992</result>