The median length of a trapezoid is 20 meters and the height is 30 meters. What is the area of the trapezoid in square meters?
一个梯形的中位线长是20米，高是30米，这个梯形的面积是多少平方米．
<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<result>600</result>