If the perimeter of a square is 100 meters, what is the area of the square?
一个正方形的周长是100米，这个正方形的面积是多少．
<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<result>625</result>