The area of a trapezoid is 5.04m**2, the sum of the upper and lower bases is 4.2m, what is the height in m?
一个梯形的面积是5.04m**2，上、下底之和是4.2m，高是多少m．
<gadget id="calculator">2 / 4.2</gadget>
<output>0.47619</output>

<gadget id="calculator">5.04 * 0.47619</gadget>
<output>2.399998</output>

<result>2.399998</result>