trapezoid with an upper base of 4 cm and a lower base of 5.5 cm has an area of 19 cm2. What is the height of this trapezoid in centimeters?
一个梯形的上底4厘米，下底是5.5厘米，面积是19平方厘米．这个梯形的高是多少厘米？
<gadget id="calculator">4 + 5.5</gadget>
<output>9.5</output>

<gadget id="calculator">2 / 9.5</gadget>
<output>0.210526</output>

<gadget id="calculator">19 * 0.210526</gadget>
<output>3.999994</output>

<result>3.999994</result>