The area of a rectangle is 48 square meters. Divide it into two identical trapezoids. If the sum of the upper and lower bases of this trapezoid is 12 meters, what is the height of the trapezoid in meters?
一个长方形的面积是48平方米，把它分成两个完全一样的梯形，如果这个梯形的上下底之和是12米，那么梯形的高是多少米．
<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<result>4</result>