A wildlife sanctuary is a rectangle with a length of 4000 meters and a width of 3000 meters. How many square kilometers does this protected area cover?
一个野生动物保护区是一个长4000米，宽3000米的长方形．这个保护区占地多少平方千米？
<gadget id="calculator">4_000 / 1_000</gadget>
<output>4</output>

<gadget id="calculator">3_000 / 1_000</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>