If the perimeter of a square is 2.2 decimeters, what is its area?
一个正方形的周长是2.2分米，它的面积是多少平方分米．
<gadget id="calculator">2.2 / 4</gadget>
<output>0.55</output>

<gadget id="calculator">0.55 * 0.55</gadget>
<output>0.3025</output>

<result>0.3025</result>