If the perimeter of a square is 64 decimeters, what is the area of the square?
一个正方形的周长是64分米，这个正方形的面积是多少平方分米．
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

<gadget id="calculator">16 * 16</gadget>
<output>256</output>

<result>256</result>