The perimeter of a square is 8 decimeters, what is the area in square decimeters
正方形的周长是8分米，面积是多少平方分米
<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<result>4</result>