Xingguang Primary School built a rectangular stadium with a perimeter of 400 meters and a length of 120 meters. What is the area of the stadium in square meters?
星光小学修建了一个长方形体育场，周长是400米，长是120米，求这个体育场的面积是多少平方米？
<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">400 - 240</gadget>
<output>160</output>

<gadget id="calculator">160 / 2</gadget>
<output>80</output>

<gadget id="calculator">120 * 80</gadget>
<output>9_600</output>

<result>9_600</result>