The perimeter of a square is 12.8 decimeters, what is the area of the square?
一个正方形的周长是12.8分米，这个正方形的面积是多少？
<gadget id="calculator">12.8 / 4</gadget>
<output>3.2</output>

<gadget id="calculator">3.2 * 3.2</gadget>
<output>10.24</output>

<result>10.24</result>