There is a square lotus pond in the garden. Its circumference is 64 meters. What is its area in square meters?
花园里有一个正方形的荷花池，它的周长是64米，面积是多少平方米？
<gadget id="calculator">64 / 4</gadget>
<output>16</output>

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

<result>256</result>