A rope 64 meters long encloses a square, what is the area of the square?
把一根长64米的绳子围成一个正方形，这个正方形的面积是多少？
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

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

<result>256</result>