A piece of parallelogram land has a base length of 30 meters and a height of 20 meters. What is the area of the land in square meters?
一块平行四边形土地，底长30米，高20米，这块土地的面积是多少平方米．
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<result>600</result>