A 1.2-meter-long iron wire encloses a square (interfaces are not counted), what is its area in square meters?
把一根长1.2米的铁丝围成一个正方形(接口不计)，他的面积是多少平方米．
<gadget id="calculator">1.2 / 4</gadget>
<output>0.3</output>

<gadget id="calculator">0.3 * 0.3</gadget>
<output>0.09</output>

<result>0.09</result>