A square flower bed has a perimeter of 16 meters, what is its area in square meters?
一个正方形的花坛，周长是16米，它的面积是多少平方米？
<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<result>16</result>