What is the area of a square whose perimeter is 12.8 cm?
有一正方形周长是12.8厘米，它的面积是多少？
<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>