The area of a trapezoid is 4.8 square meters, its height and bottom are both 2 meters, how many meters is its bottom?
一个梯形的面积是4.8平方米，它的高与下底都是2米，它的下底是多少米．
<gadget id="calculator">4.8 - 2</gadget>
<output>2.8</output>

<result>2.8</result>