If the perimeter of a square is 156 cm, what is the area in square centimeters?
一个正方形周长是156cm，面积是多少平方厘米？
<gadget id="calculator">156 / 4</gadget>
<output>39</output>

<gadget id="calculator">39 * 39</gadget>
<output>1_521</output>

<result>1_521</result>