There is a sidewalk with a width of 3 meters, covering an area of 360 square meters. For convenience, the width of the road should be increased to 12 meters, and the length remains unchanged. What is the area of the sidewalk after the extension?
有一条宽3米的人行道，占地面积360平方米．为了方便，道路的宽度要增加到12米，长不变，扩建后这条人行道的面积是多少平方米？
<gadget id="calculator">360 / 2</gadget>
<output>180</output>

<gadget id="calculator">180 * 12</gadget>
<output>2_160</output>

<result>2_160</result>