Railway Primary School has a square experimental field with a circumference of 400 meters. The school distributes it to the sixth, fifth and fourth grade students according to the ratio of 5:3:2. How many square meters are the fourth grade students managing?
铁路小学有一块正方形的实验田，其周长为400米，学校按5：3：2的比例分给六，五，四年级学生管理，四年级学生管理多少平方米？
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>

<gadget id="calculator">5 + 3 + 2</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10_000 * (1/5)</gadget>
<output>2_000</output>

<result>2_000</result>