There is a square pool in the garden, its circumference is 72 meters, what is the area in square meters?
花园里有一个正方形的水池，它的周长是72米，面积是多少平方米？
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">18 * 18</gadget>
<output>324</output>

<result>324</result>