A square and a rectangle with a width of 5 cm and an area of 204 cm2 fit together to form a rectangle. Find the maximum area of the square in cm2.
一个正方形与一个宽为5厘米，面积是204平方厘米的长方形恰好拼成一个长方形，求这个正方形面积最大是多少平方厘米．
<gadget id="calculator">204 / 5</gadget>
<output>204/5 = around 40.8</output>

<gadget id="calculator">(204/5) * (204/5)</gadget>
<output>41_616/25 = around 1_664.64</output>

<result>41_616/25 = around 1_664.64</result>