The area of a rectangular park is 200 hectares. If the length of the park is tripled and the width does not change, what is the area of the expanded park?
一个长方形公园的面积是200公顷，如果公园的长扩大为原来的3倍，宽不发生变化，则扩建后的公园的面积应是多少公顷．
<gadget id="calculator">200 * 3</gadget>
<output>600</output>

<result>600</result>