If the perimeter of a square board is 9.6 decimeters, what is its area?
一个正方形木板的周长是9.6分米，它的面积是多少平方分米．
<gadget id="calculator">9.6 / 4</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 * 2.4</gadget>
<output>5.76</output>

<result>5.76</result>