If the perimeter of a square is 85 meters, what is its area in square meters?
一个正方形方的周长有85米，它的面积是多少平方米．
<gadget id="calculator">85 / 4</gadget>
<output>85/4 = around 21.25</output>

<gadget id="calculator">(85/4) * (85/4)</gadget>
<output>7_225/16 = around 451.5625</output>

<result>7_225/16 = around 451.5625</result>