The perimeter of a square orchard is 3600 meters, how many square meters does this orchard occupy?
一个正方形果园周长为3600米，这个果园占地多少平方米？
<gadget id="calculator">3_600 / 4</gadget>
<output>900</output>

<gadget id="calculator">900 * 900</gadget>
<output>810_000</output>

<result>810_000</result>