The upper and lower bases of a trapezoid are 4 cm and 7 cm respectively, and the area is 11 square centimeters. What is the height of the trapezoid in cm?
一个梯形的上、下底分别是4厘米和7厘米，面积是11平方厘米，梯形的高为多少厘米．
<gadget id="calculator">4 + 7</gadget>
<output>11</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">11 * (2/11)</gadget>
<output>2</output>

<result>2</result>